FeNi-based MGs exhibit the most excellent room-temperature mechanical properties among different Fe-based metallic glasses(MGs)systems.However,the glass-forming ability(GFA)of FeNi-based MGs is much lower than that of...FeNi-based MGs exhibit the most excellent room-temperature mechanical properties among different Fe-based metallic glasses(MGs)systems.However,the glass-forming ability(GFA)of FeNi-based MGs is much lower than that of their counterparts.Thus,uncovering the solidification and anomalous nano-crystallization behavior of FeNi-based MGs is crucial to the development of FeNibased bulk metallic glasses with larger plasticity and critical size concurrently.Regarding this,a combination of complementary in situ synchrotron radiation high-energy X-ray diffraction,small-angle neutron scattering(SANS),and 3-dimentional atom probe tomography(3-D APT)is used to study solidification and nano-crystallization behavior of Fe_(48)Ni_(30)Mo_(3)B_(19)liquid and MG.The time–temperature–transformation diagram was successfully depicted via melting spun,in situ solidification,and isothermal annealing methods.We found that the Fe_(48)Ni_(30)Mo_(3)B_(19)MG can only be prepared via the meltspinning method to obtain amorphous ribbons,which could contribute to the low activation energy for the nano-crystallization growth E_(p).Moreover,during isothermal annealing,the anomalous slow growth behavior in kinetic of theγ-FeNi phase embedded in the amorphous matrix is caused by the Fe and Ni partitioning,and the Mo-enriched region around the nanosizedγ-FeNi phase,which is revealed by 3-D APT.These results exhibit a new perspective for understanding the relationship between GFA and nano-crystallization behavior and provide feasible guidance for the development of newγ-FeNi-containing Fe-based BMG composites with desired mechanical properties and GFA.展开更多
Owing to their exceptional properties,high-entropy alloys(HEAs)and high-entropy materials have emerged as promising research areas and shown diverse applications.Here,the recent advances in the field are comprehensive...Owing to their exceptional properties,high-entropy alloys(HEAs)and high-entropy materials have emerged as promising research areas and shown diverse applications.Here,the recent advances in the field are comprehensively reviewed,organized into five sections.The first section introduces the background of HEAs,covering their definition,significance,application prospects,basic properties,design principles,and microstructure.The subsequent section focuses on cutting-edge high-entropy structural materials,highlighting developments such as nanostructured alloys,grain boundary engineering,eutectic systems,cryogenic alloys,thin films,micro-nano-lattice structures,additive manufacturing,high entropy metallic glasses,nano-precipitate strengthened alloys,composition modulation,alloy fibers,and refractory systems.In the following section,the emphasis shifts to functional materials,exploring HEAs as catalysts,magneto-caloric materials,corrosion-resistant alloys,radiation-resistant alloys,hydrogen storage systems,and materials for biomedicine.Additionally,the review encompasses functional high-entropy materials outside the realm of alloys,including thermoelectric,quantum dots,nanooxide catalysts,energy storage materials,negative thermal expansion ceramics,and high-entropy wave absorption materials.The paper concludes with an outlook,discussing future directions and potential growth areas in the field.Through this comprehensive review,researchers,engineers,and scientists may gain valuable insights into the recent progress and opportunities for further exploration in the exciting domains of high-entropy alloys and functional materials.展开更多
Micro-alloying effects of yttrium on the recrystallization behavior of an alumina-forming austenitic（AFA）stainless steel were investigated.It was found that the grain growth kinetics of the steels doped with differe...Micro-alloying effects of yttrium on the recrystallization behavior of an alumina-forming austenitic（AFA）stainless steel were investigated.It was found that the grain growth kinetics of the steels doped with different amounts of yttrium（i.e.,0,0.05 and 0.10mass% Y）could be described by an Arrhenius type empirical equation.Added Y could interact with carbon and influence the morphology of carbides both inside grains and on the grain boundaries,thus altering the grain boundary mobility and grain growth.The steel doped with 0.05mass% yttrium showed the highest activation energy of grain growth and the most retarded recrystallization behavior,which mainly resulted from the high density of fine carbides both inside grains and on the grain boundaries.However,excess addition of0.10mass% Y induced coarsening and then lowered density of carbides,which alleviated the yttrium effects.The results also manifest that micro-alloying of rare-earth elements such as yttrium is an effective way for controlling grain growth behavior during recrystallization of AFA steels,which may have great implications on engineering applications.展开更多
Effects of nitrogen addition on glass formation and mechanical properties of the Ti42.5Cu40Zr10Ni5Sn2.5 metallic glass were systematically investigated. It was found that a small amount of nitrogen addition facilitate...Effects of nitrogen addition on glass formation and mechanical properties of the Ti42.5Cu40Zr10Ni5Sn2.5 metallic glass were systematically investigated. It was found that a small amount of nitrogen addition facilitated the glass formation by suppressing formation of the competing eutectic structure. Unlike large atomic size elements such as Hf and Pd which usually deteriorate specific strength, nitrogen can also increase the specific strength of the current Ti-based BMGs. The results are not only helpful for understanding glass-forming ability in general, but also useful in developing cost-effective, high-performance Ti-based bulk metallic glasses with enhanced glass-forming ability.展开更多
Ab st ra ct Nanocrystalline materials exhibit unique properties due to their extremely high grain boundary(GB) density.However,this high-density characteristic induces grain coarsening at elevated temperatures,thereby...Ab st ra ct Nanocrystalline materials exhibit unique properties due to their extremely high grain boundary(GB) density.However,this high-density characteristic induces grain coarsening at elevated temperatures,thereby limiting the widespread application of nanocrystalline materials.Recent experimental observations revealed that GB segregation and second-phase pinning effectively hinder GB migration,thereby improving the stability of nanocry stalline materials.In this study,a mouified phase-field model that integrates mismatch strain,solute segregation and precipitation was developed to evaluate the influence of lattice misfit on the thermal stability of nanocrystalline alloys.The simulation results indicated that introducing a suitable mismatch strain can effectively enhance the microstructural stability of nanocrystalline alloys.By synergizing precipitation with an appropriate lattice misfit,the formation of second-phase particles in the bulk grains can be suppressed,thereby facilitating solute segregation/precipitation at the GBs.This concentrated solute segregation and precipitation at the GBs effectively hinders grain migration,thereby preventing grain coarsening.These findings provide a new perspective on the design and regulation of nanocrystalline alloys with enhanced thermal stability.展开更多
Ultra-high temperature ceramics(UHTCs) offer great potential for applications in extreme service environments,such as hypersonic vehicles,rockets and re-entry spacecraft.However,the severe ablation caused by highspeed...Ultra-high temperature ceramics(UHTCs) offer great potential for applications in extreme service environments,such as hypersonic vehicles,rockets and re-entry spacecraft.However,the severe ablation caused by highspeed heat flow scouring and high-temperature oxidation limits the engineering application of UHTCs.In this work,we report a novel high-entropy UHTC(Ti_(0.2)Zr_(0.2)V_(0.2)Nb_(0.2)Cr_(0.2))(C_(0.5)N_(0.5)),which exhibits superior ablation resistance and light weight compared with traditional UHTCs.Specifically,at a temperature of 2650 K,the mass ablation rate of the material was measured as1.025×10^(-2)g·s^(-1),and the density was calculated to be 6.7 g·cm^(-3).The impressive ablation resistance of(Ti_(0.2)Zr_(0.2)V_(0.2)Nb_(0.2)Cr_(0.2))(C_(0.5)N_(0.5)) is attributed to the incorporation of a self-healing mechanism,which is associated with the in-situ formation of a medium-entropy oxide(TiVCr)O_(2) during the ablation process.The mediumentropy oxide can seal pores and cracks to retard oxygen diffusion and prevent the material from fragmentation,thereby resulting in outstanding ablation resistance.展开更多
The Mott insulator and superfluid phase transition is one of the most prominent phenomena in ultracold atoms.We report the observation of a novel 2D quantum phase transition between the Mott insulator andπsuperfluid ...The Mott insulator and superfluid phase transition is one of the most prominent phenomena in ultracold atoms.We report the observation of a novel 2D quantum phase transition between the Mott insulator andπsuperfluid in a shaking optical lattice.In the deep optical lattice regime,the lowest S band can be tuned to Mott phase,while the higher P_(x,y)bands are itinerant for having larger bandwidth.Through a shaking technique coupling the s-orbital to p_(x,y)-orbital states,we experimentally observe the transition between the states of the S and P_(x,y)bands,leading to a quantum phase transition from two-dimensional s-orbital Mott phase to the p_(x,y)-orbital superfluid which condensed at(π,π)momentum.Using the band-mapping method,we also observe the changes of atomic population in different energy bands during the transition,and the experimental results are well consistent with theoretical expectations.展开更多
To meet the increasing demand for continuously enhancing engineering performance and energy efficiency in a variety of aerospace and energy applications,structural materials with high strength at ultra-high temperatur...To meet the increasing demand for continuously enhancing engineering performance and energy efficiency in a variety of aerospace and energy applications,structural materials with high strength at ultra-high temperatures are urgently required.In the past decade,refractory multi-principal element alloys(RMPEAs),particularly those containing elements with high melting temperatures(T_(m))such as W and Ta(hereafter denoted as WTa-RMPEAs),have garnered extensive interest due to their exceptional strengths and thermally stability at high temperatures.Characterized by high T_(m),sluggish diffusion,and severe lattice distortion,WTa-RMPEAs exhibit chemical composition fluctuations at different scales,leading to unique mechanical properties and deformation behavior.In this paper,an initial summary is provided of the mechanical properties of typical WTa-RMPEAs at room and high temperatures and the differences in deformation behavior and underlying mechanisms between RMPEAs and conventional alloys are discussed.Additionally,strengthening and toughening strategies and the suggested deformation mechanisms were reviewed.Finally,the challenges in revealing the actual deformation mechanism of WTa-RMPEAs were described,and a brief perspective on the future research of the mechanical behavior of WTa-RMPEAs was proposed.展开更多
Majorana zero modes(MZMs)are the most intensively studied non-Abelian anyons.The Dirac fermion zero modes in topological insulators,which are symmetry-protected doubling of MZMs under fermion number conservation,offer...Majorana zero modes(MZMs)are the most intensively studied non-Abelian anyons.The Dirac fermion zero modes in topological insulators,which are symmetry-protected doubling of MZMs under fermion number conservation,offer an alternative approach to explore non-Abelian anyons.However,a unified model that elucidates the braiding statistics of these types of topological zero modes remains absent.We show that the minimal Kitaev chain model beyond fine-tuning regime provides a unified characterization of the non-Abelian statistics of both MZMs and Dirac fermion zero modes in different parameter regimes.In particular,we introduce a minimal tri-junction setting based on the minimal Kitaev chain model and show it facilitates the unified scheme of braiding Dirac fermion zero modes,as well as the MZMs in the assistance of a Dirac mode.This unified minimal model provides deeper insights into non-Abelian statistics,demonstrating that the non-Abelian braiding of MZMs can be continuously extended to encompass Dirac fermion zero modes.The minimal Kitaev chain has been realized in coupled quantum dots(Nature 614,445(2023);Nature 641,890(2025)).Our extension,which demonstrates novel nontrivial phases with non-Abelian MZM pairs and Dirac zero modes emerging in the broader parameter regimes without fine-tuning,expands the accessible experimental parameter space and enhances the feasibility of observing non-Abelian statistics in the minimal Kitaev chain model.展开更多
Topological phase of matter is now a mainstream of research in condensed matter physics, of which the classification, synthesis, and detection of topological states have brought excitements over the recent decade whil...Topological phase of matter is now a mainstream of research in condensed matter physics, of which the classification, synthesis, and detection of topological states have brought excitements over the recent decade while remain incomplete with ongoing challenges in both theory and experiment. Here we propose to establish a universal non-equilibrium characterization of the equilibrium topological quantum phases classified by integers, and further propose the high-precision dynamical schemes to detect such states. The framework of the dynamical classification theory consists of basic theorems. First, we uncover that classifying a d-dimensional(dD) gapped topological phase of generic multibands can reduce to a(d-1)D invariant defined on so-called band inversion surfaces(BISs), rendering a bulk-surface duality which simplifies the topological characterization. Further, we show in quenching across phase boundary the(pseudo) spin dynamics to exhibit unique topological patterns on BISs, which are attributed to the post-quench bulk topology and manifest a dynamical bulk-surface correspondence. For this the topological phase is classified by a dynamical topological invariant measured from an emergent dynamical spintexture field on the BISs. Applications to quenching experiments on feasible models are proposed and studied, demonstrating the new experimental strategies to detect topological phases with high feasibility. This work opens a broad new direction to classify and detect topological phases by non-equilibrium quantum dynamics.展开更多
Weyl fermion is a massless Dirac fermion with definite chirality,which has been long pursued since 1929.Though it has not been observed as a fundamental particle in nature,Weyl fermion can be realized as low-energy ex...Weyl fermion is a massless Dirac fermion with definite chirality,which has been long pursued since 1929.Though it has not been observed as a fundamental particle in nature,Weyl fermion can be realized as low-energy excitation around Weyl point in Weyl semimetal,which possesses Weyl fermion cones in the bulk and nontrivial Fermi arc states on the surface. As a firstly discovered Weyl semimetal,Ta As crystal possesses 12 pairs of Weyl points in the momentum space,which are topologically protected against small perturbations. Here,we report for the first time the tip induced superconductivity on Ta As crystal by point contact spectroscopy. The zero bias conductance peak as well as a conductance plateau with double conductance peaks and sharp double dips are observed in the point contact spectra simultaneously,indicating unconventional superconductivity. Our further theoretical study suggests that the induced superconductivity may have nontrivial topology. The present work opens a new route in investigating the novel superconducting states based on Weyl materials.展开更多
There is an immense effort in search for various types of Weyl semimetals, of which the most fundamental phase consists of the minimal number of i.e. two Weyl points, but is hard to engineer in solids. Here we demonst...There is an immense effort in search for various types of Weyl semimetals, of which the most fundamental phase consists of the minimal number of i.e. two Weyl points, but is hard to engineer in solids. Here we demonstrate how such fundamental Weyl semimetal can be realized in a maneuverable optical Raman lattice, with which the three-dimensional(3D) spin-orbit(SO) coupling is synthesised for ultracold atoms. In addition, a new novel Weyl phase with coexisting Weyl nodal points and nodal ring is also predicted here, and is shown to be protected by nontrivial linking numbers. We further propose feasible techniques to precisely resolve 3D Weyl band topology through 2D equilibrium and dynamical measurements. This work leads to the first realization of the most fundamental Weyl semimetal band and the 3D SO coupling for ultracold quantum gases, which are respectively the significant issues in the condensed matter and ultracold atom physics.展开更多
Measuring topological invariants is an essential task in characterizing topological phases of matter.They are usually obtained from the number of edge states due to the bulk-edge correspondence or from interference si...Measuring topological invariants is an essential task in characterizing topological phases of matter.They are usually obtained from the number of edge states due to the bulk-edge correspondence or from interference since they are integrals of the geometric phases in the energy band.It is commonly believed that the bulk band structures could not be directly used to obtain the topological invariants.Here,we implement the experimental extraction of Zak phase from the bulk band structures of a Su-Schrieffer-Heeger(SSH)model in the synthetic frequency dimension.Such synthetic SSH lattices are constructed in the frequency axis of light,by controlling the coupling strengths between the symmetric and antisymmetric supermodes of two bichromatically driven rings.We measure the transmission spectra and obtain the projection of the time-resolved band structure on lattice sites,where a strong contrast between the non-trivial and trivial topological phases is observed.The topological Zak phase is naturally encoded in the bulk band structures of the synthetic SSH lattices,which can hence be experimentally extracted from the transmission spectra in a fiber-based modulated ring platform using a laser with telecom wavelength.Our method of extracting topological phases from the bulk band structure can be further extended to characterize topological invariants in higher dimensions,while the exhibited trivial and non-trivial transmission spectra from the topological transition may find future applications in optical communications.展开更多
The notion of topological phases extended to dynamical systems stimulates extensive studies,of which the characterization of nonequilibrium topological invariants is a central issue and usually necessitates the inform...The notion of topological phases extended to dynamical systems stimulates extensive studies,of which the characterization of nonequilibrium topological invariants is a central issue and usually necessitates the information of quantum dynamics in both the time and momentum dimensions.Here,we propose the topological holographic quench dynamics in synthetic dimension,and also show it provides a highly efficient scheme to characterize photonic topological phases.A pseudospin model is constructed with ring resonators in a synthetic lattice formed by frequencies of light,and the quench dynamics is induced by initializing a trivial state,which evolves under a topological Hamiltonian.Our key prediction is that the complete topological information of the Hamiltonian is encoded in quench dynamics solely in the time dimension,and is further mapped to lower-dimensional space,manifesting the holographic features of the dynamics.In particular,two fundamental time scales emerge in the dynamical evolution,with one mimicking the topological band on the momentum dimension and the other characterizing the residue time evolution of the state after the quench.For this,a universal duality between the quench dynamics and the equilibrium topological phase of the spin model is obtained in the time dimension by extracting information from the field evolution dynamics in modulated ring systems in simulations.This work also shows that the photonic synthetic frequency dimension provides an efficient and powerful way to explore the topological nonequilibrium dynamics.展开更多
The free-fermion topological phases with Z_(2)invariants cover a broad range of topological states,including the time-reversal invariant topological insulators,and are defined on the equilibrium ground states.Whether ...The free-fermion topological phases with Z_(2)invariants cover a broad range of topological states,including the time-reversal invariant topological insulators,and are defined on the equilibrium ground states.Whether such equilibrium topological phases have universal correspondence to far-from-equilibrium quantum dynamics is a fundamental issue of both theoretical and experimental importance.Here we uncover the universal topological quench dynamics linking to these equilibrium topological phases of different dimensionality and symmetry classes in the tenfold way,with a general framework being established.We show a novel result that a generic d-dimensional topological phase represented by Dirac type Hamiltonian and with Z_(2)invariant defined on high symmetry momenta can be characterized by topology reduced to certain arbitrary discrete momenta of Brillouin zone called the highest-order bandinversion surfaces.Such dimension-reduced topology has unique correspondence to the topological pattern emerging in far-from-equilibrium quantum dynamics by quenching the system from trivial phase to the topological regime,rendering the dynamical hallmark of the equilibrium topological phase.This work completes the dynamical characterization for the full tenfold classes of topological phases,which can be partially extended to even broader topological phases protected by lattice symmetries and in non-Dirac type systems,and shall advance widely the research in theory and experiment.展开更多
The metallic tip-induced superconductivity in normal Weyl semimetal offers a promising platform to study topological superconductivity,which is currently a research focus in condensed matter physics.Here we experiment...The metallic tip-induced superconductivity in normal Weyl semimetal offers a promising platform to study topological superconductivity,which is currently a research focus in condensed matter physics.Here we experimentally uncover that unconventional superconductivity can be induced by hard point contact(PC)method of ferromagnetic tips in Ta As single crystals.The magneto-transport measurements of the ferromagnetic tip-induced superconducting(FTISC)states exhibit the quantum oscillations,which reveal that the superconductivity is induced in the topologically nontrivial Fermi surface of the Weyl semimetal,and show compatibility of ferromagnetism and induced superconductivity.We further measure the point contact spectra(PCS)of tunneling transport for FTISC states which are potentially of nontrivial topology.Considering that the magnetic Weyl semimetal with novel superconductivity is hard to realize in experiment,our results show a new route to investigate the unconventional superconductivity by combining the topological semimetal with ferromagnetism through hard PC method.展开更多
Coherently driven atomic gases inside optical cavities hold great promise for generating rich dynam- ics and exotic states of matter. It was shown recently that. an exotic topological superradiant state exists in a tw...Coherently driven atomic gases inside optical cavities hold great promise for generating rich dynam- ics and exotic states of matter. It was shown recently that. an exotic topological superradiant state exists in a two-component degenerate Fermi gas coupled to a cavity, where local order parameters coexist with global topological invariants. In this work, we characterize in detail various properties of this exotic state, focusing on the feedback interactions between the atoms and the cavity field. In particular, we demonstrate that cavity-induced interband coupling plays a crucial role in inducing the topological phase transition between the conventional and topological superradiant states. We analyze the interesting signatures in the cavity field left by the closing and reopening of the atomic bulk gap across the topological phase boundary and discuss the robustness of the topological superradiant state by investigating the steady-state phase diagram under various conditions. Furthermore, we consider the interaction effect and discuss the interplay between the pairing order in atomic ensembles and the superradiance of the cavity mode. Our work provides many valuable insights into the unique cavity-atom hybrid system under study and is helpful for future experimental exploration of the topological superradiant state.展开更多
To investigate the band structure is one of the key approaches to study the fundamental properties of a novel material.We report here the precision band mapping of a 2-dimensional(2D) spin-orbit(SO) coupling in an opt...To investigate the band structure is one of the key approaches to study the fundamental properties of a novel material.We report here the precision band mapping of a 2-dimensional(2D) spin-orbit(SO) coupling in an optical lattice.By applying the microwave spin-injection spectroscopy, the band structure and spin-polarization distribution are achieved simultaneously.The band topology is also addressed with observing the band gap close and re-open at the Dirac points.Furthermore, the lattice depth and the Raman coupling strength are precisely calibrated with relative errors in the order of 10^(-3).Our approach could also be applied for exploring the exotic topological phases with even higher dimensional system.展开更多
The realization of spin-orbit-coupled ultracold gases has driven a wide range of research and is typically based on the rotating wave approximation(RWA).By neglecting the counter-rotating terms,RWA characterizes a sin...The realization of spin-orbit-coupled ultracold gases has driven a wide range of research and is typically based on the rotating wave approximation(RWA).By neglecting the counter-rotating terms,RWA characterizes a single near-resonant spin-orbit(SO)coupling in a two-level system.Here,we propose and experimentally realize a new scheme for achieving a pair of two-dimensional(2D)SO couplings for ultracold fermions beyond RWA.This work not only realizes the first anomalous Floquet topological Fermi gas beyond RWA,but also significantly improves the lifetime of the 2D-SO-coupled Fermi gas.Based on pump-probe quench measurements,we observe a deterministic phase relation between two sets of SO couplings,which is characteristic of our beyond-RWA scheme and enables the two SO couplings to be simultaneously tuned to the optimum 2D configurations.We observe intriguing band topology by measuring two-ring band-inversion surfaces,quantitatively consistent with a Floquet topological Fermi gas in the regime of high Chern numbers.Our study can open an avenue to explore exotic SO physics and anomalous topological states based on long-lived SO-coupled ultracold fermions.展开更多
基金financially supported by the National Key R&D Program of China(No.2022YFA1603801)the Open Fund of the Science and Technology on Metrology and Calibration Laboratory(No.JLKG2023001C004)+6 种基金the National Natural Science Foundation of China(Nos.52130108,52301213,52071024,52271003,and 52101188)Guangdong Basic and Applied Basic Research Foundation(Nos.2022A1515110805,2021B1515140028,and 2021CX02C087)the Open Fund of the China Spallation Neutron Source Songshan Lake Science City(No.KFKT2023B11)Construction of a Coordination Network for Science and Technology Assistance to Latin American Countries(Science and Technology Partnership Program,Ministry of Science and Technology of China,No.KY202401006)the Youth Innovation Promotion Association,CAS(No.2020010)the State Key Lab of Advanced Metals and Materials(No.2022-ZD01)the SSRF proposal(No.2024-SSRF-PT-506766)
文摘FeNi-based MGs exhibit the most excellent room-temperature mechanical properties among different Fe-based metallic glasses(MGs)systems.However,the glass-forming ability(GFA)of FeNi-based MGs is much lower than that of their counterparts.Thus,uncovering the solidification and anomalous nano-crystallization behavior of FeNi-based MGs is crucial to the development of FeNibased bulk metallic glasses with larger plasticity and critical size concurrently.Regarding this,a combination of complementary in situ synchrotron radiation high-energy X-ray diffraction,small-angle neutron scattering(SANS),and 3-dimentional atom probe tomography(3-D APT)is used to study solidification and nano-crystallization behavior of Fe_(48)Ni_(30)Mo_(3)B_(19)liquid and MG.The time–temperature–transformation diagram was successfully depicted via melting spun,in situ solidification,and isothermal annealing methods.We found that the Fe_(48)Ni_(30)Mo_(3)B_(19)MG can only be prepared via the meltspinning method to obtain amorphous ribbons,which could contribute to the low activation energy for the nano-crystallization growth E_(p).Moreover,during isothermal annealing,the anomalous slow growth behavior in kinetic of theγ-FeNi phase embedded in the amorphous matrix is caused by the Fe and Ni partitioning,and the Mo-enriched region around the nanosizedγ-FeNi phase,which is revealed by 3-D APT.These results exhibit a new perspective for understanding the relationship between GFA and nano-crystallization behavior and provide feasible guidance for the development of newγ-FeNi-containing Fe-based BMG composites with desired mechanical properties and GFA.
基金financially supported by the National Key R&D Program of China(No.2021YFB3802800)the National Natural Science Foundation of China(Nos.52222104,12261160364,51871120,51520105001,22275089,52071157,52231005,52201174,52171165,52261033,52371155,51801128,52171219,U20A20278,52371106,22071221,52122408,52201190,22075014,52272040,62222405,22125602,and 52301052)+11 种基金the Natural Science Foundation of Jiangsu Province(Nos.BK20200019,BK20220858 and BK20231458)support by the open research fund of Songshan Lake Materials Laboratory(No.2022SLABFN19)support by Guangdong Basic and Applied Basic Research Foundation(No2024B1515020010)support by Shanxi Province Youth Innovation Team Project(No.22JP042)support by the National Science Fund for Distinguished Young Scholars of China(No.52325102)support by the Large Scientific Facility Open Subject of Songshan Lake,Dongguan,Guangdongsupport by the research institute for Advanced Manufacturing Fund(No.P0046108)support by the Hong Kong RGC general research fund(No.11200623)and CRF project C7074-23Gfinancial support from the Australian Research CouncilHBIS-UQ Innovation Centre for Sustainable Steel projectthe QUT Capacity Building Professor Programsupport by the Fundamental Research Funds for the Central Universities(No.30923010211)。
文摘Owing to their exceptional properties,high-entropy alloys(HEAs)and high-entropy materials have emerged as promising research areas and shown diverse applications.Here,the recent advances in the field are comprehensively reviewed,organized into five sections.The first section introduces the background of HEAs,covering their definition,significance,application prospects,basic properties,design principles,and microstructure.The subsequent section focuses on cutting-edge high-entropy structural materials,highlighting developments such as nanostructured alloys,grain boundary engineering,eutectic systems,cryogenic alloys,thin films,micro-nano-lattice structures,additive manufacturing,high entropy metallic glasses,nano-precipitate strengthened alloys,composition modulation,alloy fibers,and refractory systems.In the following section,the emphasis shifts to functional materials,exploring HEAs as catalysts,magneto-caloric materials,corrosion-resistant alloys,radiation-resistant alloys,hydrogen storage systems,and materials for biomedicine.Additionally,the review encompasses functional high-entropy materials outside the realm of alloys,including thermoelectric,quantum dots,nanooxide catalysts,energy storage materials,negative thermal expansion ceramics,and high-entropy wave absorption materials.The paper concludes with an outlook,discussing future directions and potential growth areas in the field.Through this comprehensive review,researchers,engineers,and scientists may gain valuable insights into the recent progress and opportunities for further exploration in the exciting domains of high-entropy alloys and functional materials.
基金Item Sponsored by National Natural Science Foundation of China(51531001,51422101,51371003,51271212)111 Project(B07003)+3 种基金International Science and Technology Cooperation Program of China(2015DFG52600)Program for Changjiang Scholars and Innovative Research Team in University of China(IRT_14R05)Fundamental Research Fund for the Central Universities of China(FRF-TP-15-004C1,FRF-TP-14-009C1)Top-Notch Young Talents Program of China
文摘Micro-alloying effects of yttrium on the recrystallization behavior of an alumina-forming austenitic（AFA）stainless steel were investigated.It was found that the grain growth kinetics of the steels doped with different amounts of yttrium（i.e.,0,0.05 and 0.10mass% Y）could be described by an Arrhenius type empirical equation.Added Y could interact with carbon and influence the morphology of carbides both inside grains and on the grain boundaries,thus altering the grain boundary mobility and grain growth.The steel doped with 0.05mass% yttrium showed the highest activation energy of grain growth and the most retarded recrystallization behavior,which mainly resulted from the high density of fine carbides both inside grains and on the grain boundaries.However,excess addition of0.10mass% Y induced coarsening and then lowered density of carbides,which alleviated the yttrium effects.The results also manifest that micro-alloying of rare-earth elements such as yttrium is an effective way for controlling grain growth behavior during recrystallization of AFA steels,which may have great implications on engineering applications.
基金financially supported by the National Natural Science Foundation of China(Nos.5145100151531001+3 种基金5142210151271212 and 51371003)111 Project(No.B07003)Program for Changjiang Scholars and Innovative Research Team in University(No.IRT_14R05)
文摘Effects of nitrogen addition on glass formation and mechanical properties of the Ti42.5Cu40Zr10Ni5Sn2.5 metallic glass were systematically investigated. It was found that a small amount of nitrogen addition facilitated the glass formation by suppressing formation of the competing eutectic structure. Unlike large atomic size elements such as Hf and Pd which usually deteriorate specific strength, nitrogen can also increase the specific strength of the current Ti-based BMGs. The results are not only helpful for understanding glass-forming ability in general, but also useful in developing cost-effective, high-performance Ti-based bulk metallic glasses with enhanced glass-forming ability.
基金financially supported by the National Natural Science Foundation of China (Nos.52122408, 51901013,51971018,52101188,52225103,52071023 and U20B2025)the Funds for Creative Research Groups of NSFC (No.51921001)the financial support from the Fundamental Research Funds for the Central Universities (University of Science and Technology Beijing,Nos.FRF-TP-2021-04C1 and 06500135)。
文摘Ab st ra ct Nanocrystalline materials exhibit unique properties due to their extremely high grain boundary(GB) density.However,this high-density characteristic induces grain coarsening at elevated temperatures,thereby limiting the widespread application of nanocrystalline materials.Recent experimental observations revealed that GB segregation and second-phase pinning effectively hinder GB migration,thereby improving the stability of nanocry stalline materials.In this study,a mouified phase-field model that integrates mismatch strain,solute segregation and precipitation was developed to evaluate the influence of lattice misfit on the thermal stability of nanocrystalline alloys.The simulation results indicated that introducing a suitable mismatch strain can effectively enhance the microstructural stability of nanocrystalline alloys.By synergizing precipitation with an appropriate lattice misfit,the formation of second-phase particles in the bulk grains can be suppressed,thereby facilitating solute segregation/precipitation at the GBs.This concentrated solute segregation and precipitation at the GBs effectively hinders grain migration,thereby preventing grain coarsening.These findings provide a new perspective on the design and regulation of nanocrystalline alloys with enhanced thermal stability.
基金financially supported by the National Natural Science Foundation of China (Nos.52271003,52071024,52271003 and 52101188)the Funds for Creative Research Groups of China (No.51921001)+5 种基金the Projects of International Cooperation and Exchanges of NSFC (Nos.51961160729 and 52061135207)111 Project (No.BP0719004)the Program for Changjiang Scholars and Innovative Research Team in University of China (No.IRT_14R05)the Fundamental Research Fund for the Central Universities of Chinathe Project of Science and Technology on Plasma Dynamics Laboratory,Air Force Engineering University,Xi'an,China (No.126142202210206)the State Key Lab for Advanced Metals and Materials (No.2022-Z10)。
文摘Ultra-high temperature ceramics(UHTCs) offer great potential for applications in extreme service environments,such as hypersonic vehicles,rockets and re-entry spacecraft.However,the severe ablation caused by highspeed heat flow scouring and high-temperature oxidation limits the engineering application of UHTCs.In this work,we report a novel high-entropy UHTC(Ti_(0.2)Zr_(0.2)V_(0.2)Nb_(0.2)Cr_(0.2))(C_(0.5)N_(0.5)),which exhibits superior ablation resistance and light weight compared with traditional UHTCs.Specifically,at a temperature of 2650 K,the mass ablation rate of the material was measured as1.025×10^(-2)g·s^(-1),and the density was calculated to be 6.7 g·cm^(-3).The impressive ablation resistance of(Ti_(0.2)Zr_(0.2)V_(0.2)Nb_(0.2)Cr_(0.2))(C_(0.5)N_(0.5)) is attributed to the incorporation of a self-healing mechanism,which is associated with the in-situ formation of a medium-entropy oxide(TiVCr)O_(2) during the ablation process.The mediumentropy oxide can seal pores and cracks to retard oxygen diffusion and prevent the material from fragmentation,thereby resulting in outstanding ablation resistance.
基金supported by the National Natural Science Foundation of China(Grant Nos.11920101004,11934002)the National Key Research and Development Program of China(Grant Nos.2021YFA1400900,2021YFA0718300)。
文摘The Mott insulator and superfluid phase transition is one of the most prominent phenomena in ultracold atoms.We report the observation of a novel 2D quantum phase transition between the Mott insulator andπsuperfluid in a shaking optical lattice.In the deep optical lattice regime,the lowest S band can be tuned to Mott phase,while the higher P_(x,y)bands are itinerant for having larger bandwidth.Through a shaking technique coupling the s-orbital to p_(x,y)-orbital states,we experimentally observe the transition between the states of the S and P_(x,y)bands,leading to a quantum phase transition from two-dimensional s-orbital Mott phase to the p_(x,y)-orbital superfluid which condensed at(π,π)momentum.Using the band-mapping method,we also observe the changes of atomic population in different energy bands during the transition,and the experimental results are well consistent with theoretical expectations.
基金supported by the National Natural Science Foundation of China(Nos.52201171,52225103,12335017)the Fundamental Research Funds for the Central Universities,China(No.FRF-IDRY-23-001)+1 种基金the Funds for Creative Research Groups of China(No.51921001)China United Gas Turbin Technology Co.,Ltd.under the project of J721.
文摘To meet the increasing demand for continuously enhancing engineering performance and energy efficiency in a variety of aerospace and energy applications,structural materials with high strength at ultra-high temperatures are urgently required.In the past decade,refractory multi-principal element alloys(RMPEAs),particularly those containing elements with high melting temperatures(T_(m))such as W and Ta(hereafter denoted as WTa-RMPEAs),have garnered extensive interest due to their exceptional strengths and thermally stability at high temperatures.Characterized by high T_(m),sluggish diffusion,and severe lattice distortion,WTa-RMPEAs exhibit chemical composition fluctuations at different scales,leading to unique mechanical properties and deformation behavior.In this paper,an initial summary is provided of the mechanical properties of typical WTa-RMPEAs at room and high temperatures and the differences in deformation behavior and underlying mechanisms between RMPEAs and conventional alloys are discussed.Additionally,strengthening and toughening strategies and the suggested deformation mechanisms were reviewed.Finally,the challenges in revealing the actual deformation mechanism of WTa-RMPEAs were described,and a brief perspective on the future research of the mechanical behavior of WTa-RMPEAs was proposed.
基金supported by the National Key R&D Program of China(Grant Nos.2024YFA1409000,and 2021YFA1400900)the Innovation Program for Quantum Science and Technology(Grant Nos.2021ZD0302400,and 2021ZD0302000)+3 种基金the National Natural Science Foundation of China(Grant Nos.12304194,12574171,12425401,and 12261160368)Shanghai Municipal Science and Technology(Grant No.24DP2600100)Shanghai Pilot Program for Basic Research-Fudan University 1TQ1400100(25TQ003)Shanghai Science and Technology Innovation Action Plan(Grant No.24LZ1400800).The authors thank Leo P.Kouwenhoven and Chun-Xiao Liu for fruitful discussions.
文摘Majorana zero modes(MZMs)are the most intensively studied non-Abelian anyons.The Dirac fermion zero modes in topological insulators,which are symmetry-protected doubling of MZMs under fermion number conservation,offer an alternative approach to explore non-Abelian anyons.However,a unified model that elucidates the braiding statistics of these types of topological zero modes remains absent.We show that the minimal Kitaev chain model beyond fine-tuning regime provides a unified characterization of the non-Abelian statistics of both MZMs and Dirac fermion zero modes in different parameter regimes.In particular,we introduce a minimal tri-junction setting based on the minimal Kitaev chain model and show it facilitates the unified scheme of braiding Dirac fermion zero modes,as well as the MZMs in the assistance of a Dirac mode.This unified minimal model provides deeper insights into non-Abelian statistics,demonstrating that the non-Abelian braiding of MZMs can be continuously extended to encompass Dirac fermion zero modes.The minimal Kitaev chain has been realized in coupled quantum dots(Nature 614,445(2023);Nature 641,890(2025)).Our extension,which demonstrates novel nontrivial phases with non-Abelian MZM pairs and Dirac zero modes emerging in the broader parameter regimes without fine-tuning,expands the accessible experimental parameter space and enhances the feasibility of observing non-Abelian statistics in the minimal Kitaev chain model.
基金supported by the National Key Research and Development Program of China (2016YFA0301604)National Natural Science Foundation of China (11574008 and 11761161003)the Thousand-Young-Talent Program of China
文摘Topological phase of matter is now a mainstream of research in condensed matter physics, of which the classification, synthesis, and detection of topological states have brought excitements over the recent decade while remain incomplete with ongoing challenges in both theory and experiment. Here we propose to establish a universal non-equilibrium characterization of the equilibrium topological quantum phases classified by integers, and further propose the high-precision dynamical schemes to detect such states. The framework of the dynamical classification theory consists of basic theorems. First, we uncover that classifying a d-dimensional(dD) gapped topological phase of generic multibands can reduce to a(d-1)D invariant defined on so-called band inversion surfaces(BISs), rendering a bulk-surface duality which simplifies the topological characterization. Further, we show in quenching across phase boundary the(pseudo) spin dynamics to exhibit unique topological patterns on BISs, which are attributed to the post-quench bulk topology and manifest a dynamical bulk-surface correspondence. For this the topological phase is classified by a dynamical topological invariant measured from an emergent dynamical spintexture field on the BISs. Applications to quenching experiments on feasible models are proposed and studied, demonstrating the new experimental strategies to detect topological phases with high feasibility. This work opens a broad new direction to classify and detect topological phases by non-equilibrium quantum dynamics.
基金financially supported by National Basic Research Program of China (2013CB934600,2012CB927400,2012CB921300,and 2016YFA0301604)the Research Fund for the Doctoral Program of Higher Education (RFDP) of China+2 种基金the Open Project Program of the Pulsed High Magnetic Field Facility (PHMFF2015002)Huazhong University of Science and Technology,Open Research Fund Program of the State Key Laboratory of Low Dimensional Quantum Physicsthe National Natural Science Foundation of China (11474008 and 11574008)
文摘Weyl fermion is a massless Dirac fermion with definite chirality,which has been long pursued since 1929.Though it has not been observed as a fundamental particle in nature,Weyl fermion can be realized as low-energy excitation around Weyl point in Weyl semimetal,which possesses Weyl fermion cones in the bulk and nontrivial Fermi arc states on the surface. As a firstly discovered Weyl semimetal,Ta As crystal possesses 12 pairs of Weyl points in the momentum space,which are topologically protected against small perturbations. Here,we report for the first time the tip induced superconductivity on Ta As crystal by point contact spectroscopy. The zero bias conductance peak as well as a conductance plateau with double conductance peaks and sharp double dips are observed in the point contact spectra simultaneously,indicating unconventional superconductivity. Our further theoretical study suggests that the induced superconductivity may have nontrivial topology. The present work opens a new route in investigating the novel superconducting states based on Weyl materials.
基金supported by the National Natural Science Foundation of China (11825401, 11761161003, and 11921005)the National Key R&D Program of China (2016YFA0301604)Strategic Priority Research Program of CAS (XDB28000000)。
文摘There is an immense effort in search for various types of Weyl semimetals, of which the most fundamental phase consists of the minimal number of i.e. two Weyl points, but is hard to engineer in solids. Here we demonstrate how such fundamental Weyl semimetal can be realized in a maneuverable optical Raman lattice, with which the three-dimensional(3D) spin-orbit(SO) coupling is synthesised for ultracold atoms. In addition, a new novel Weyl phase with coexisting Weyl nodal points and nodal ring is also predicted here, and is shown to be protected by nontrivial linking numbers. We further propose feasible techniques to precisely resolve 3D Weyl band topology through 2D equilibrium and dynamical measurements. This work leads to the first realization of the most fundamental Weyl semimetal band and the 3D SO coupling for ultracold quantum gases, which are respectively the significant issues in the condensed matter and ultracold atom physics.
基金supported by National Natural Science Foundation of China(12104297,12122407,11974245,11825401,12192252,12204304)National Key Research and Development Program of China(2021YFA1400900)+1 种基金Shanghai Municipal Science and Technology Major Project(2019SHZDZX01-Zx06)the Innovation Program for Quantum Science and Technology(2021ZD0302000)。
文摘Measuring topological invariants is an essential task in characterizing topological phases of matter.They are usually obtained from the number of edge states due to the bulk-edge correspondence or from interference since they are integrals of the geometric phases in the energy band.It is commonly believed that the bulk band structures could not be directly used to obtain the topological invariants.Here,we implement the experimental extraction of Zak phase from the bulk band structures of a Su-Schrieffer-Heeger(SSH)model in the synthetic frequency dimension.Such synthetic SSH lattices are constructed in the frequency axis of light,by controlling the coupling strengths between the symmetric and antisymmetric supermodes of two bichromatically driven rings.We measure the transmission spectra and obtain the projection of the time-resolved band structure on lattice sites,where a strong contrast between the non-trivial and trivial topological phases is observed.The topological Zak phase is naturally encoded in the bulk band structures of the synthetic SSH lattices,which can hence be experimentally extracted from the transmission spectra in a fiber-based modulated ring platform using a laser with telecom wavelength.Our method of extracting topological phases from the bulk band structure can be further extended to characterize topological invariants in higher dimensions,while the exhibited trivial and non-trivial transmission spectra from the topological transition may find future applications in optical communications.
基金This paper was supported by the National Natural Science Foundation of China(11974245,11825401,and 11761161003)National Key R&D Program of China(2017YFA0303701)+3 种基金Shanghai Municipal Science and Technology Major Project(2019SHZDZX01)Natural Science Foundation of Shanghai(19ZR1475700)by the Open Project of Shenzhen Institute of Quantum Science and Engineering(Grant No.SIQSE202003)L.Y.acknowledges support from the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning.X.C.also acknowledges the support from Shandong Quancheng Scholarship(00242019024).
文摘The notion of topological phases extended to dynamical systems stimulates extensive studies,of which the characterization of nonequilibrium topological invariants is a central issue and usually necessitates the information of quantum dynamics in both the time and momentum dimensions.Here,we propose the topological holographic quench dynamics in synthetic dimension,and also show it provides a highly efficient scheme to characterize photonic topological phases.A pseudospin model is constructed with ring resonators in a synthetic lattice formed by frequencies of light,and the quench dynamics is induced by initializing a trivial state,which evolves under a topological Hamiltonian.Our key prediction is that the complete topological information of the Hamiltonian is encoded in quench dynamics solely in the time dimension,and is further mapped to lower-dimensional space,manifesting the holographic features of the dynamics.In particular,two fundamental time scales emerge in the dynamical evolution,with one mimicking the topological band on the momentum dimension and the other characterizing the residue time evolution of the state after the quench.For this,a universal duality between the quench dynamics and the equilibrium topological phase of the spin model is obtained in the time dimension by extracting information from the field evolution dynamics in modulated ring systems in simulations.This work also shows that the photonic synthetic frequency dimension provides an efficient and powerful way to explore the topological nonequilibrium dynamics.
基金supported by the National Key Research and Development Program of China(2021YFA1400900)the National Natural Science Foundation of China(11825401 and 11921005)+1 种基金the Open Project of Shenzhen Institute of Quantum Science and Engineering(SIQSE202003)the Strategic Priority Research Program of Chinese Academy of Sciences(XDB28000000)。
文摘The free-fermion topological phases with Z_(2)invariants cover a broad range of topological states,including the time-reversal invariant topological insulators,and are defined on the equilibrium ground states.Whether such equilibrium topological phases have universal correspondence to far-from-equilibrium quantum dynamics is a fundamental issue of both theoretical and experimental importance.Here we uncover the universal topological quench dynamics linking to these equilibrium topological phases of different dimensionality and symmetry classes in the tenfold way,with a general framework being established.We show a novel result that a generic d-dimensional topological phase represented by Dirac type Hamiltonian and with Z_(2)invariant defined on high symmetry momenta can be characterized by topology reduced to certain arbitrary discrete momenta of Brillouin zone called the highest-order bandinversion surfaces.Such dimension-reduced topology has unique correspondence to the topological pattern emerging in far-from-equilibrium quantum dynamics by quenching the system from trivial phase to the topological regime,rendering the dynamical hallmark of the equilibrium topological phase.This work completes the dynamical characterization for the full tenfold classes of topological phases,which can be partially extended to even broader topological phases protected by lattice symmetries and in non-Dirac type systems,and shall advance widely the research in theory and experiment.
基金financially supported by the National Key R&D Program of China (2018YFA0305604, 2017YFA0303302, and 2016YFA0301604)the National Natural Science Foundation of China (11888101, 11774008, 0401210001, 11574008, 11761161003, 11825401, 11704279, 11774255, U1832214, and 11774007)+3 种基金the Strategic Priority Research Program of Chinese Academy of Sciences (XDB28000000)the Beijing Natural Science Foundation (Z180010)the Key Project of Natural Science Foundation of Tianjin City (17JCZDJC30100)China Postdoctoral Science Foundation (0401130005)
文摘The metallic tip-induced superconductivity in normal Weyl semimetal offers a promising platform to study topological superconductivity,which is currently a research focus in condensed matter physics.Here we experimentally uncover that unconventional superconductivity can be induced by hard point contact(PC)method of ferromagnetic tips in Ta As single crystals.The magneto-transport measurements of the ferromagnetic tip-induced superconducting(FTISC)states exhibit the quantum oscillations,which reveal that the superconductivity is induced in the topologically nontrivial Fermi surface of the Weyl semimetal,and show compatibility of ferromagnetism and induced superconductivity.We further measure the point contact spectra(PCS)of tunneling transport for FTISC states which are potentially of nontrivial topology.Considering that the magnetic Weyl semimetal with novel superconductivity is hard to realize in experiment,our results show a new route to investigate the unconventional superconductivity by combining the topological semimetal with ferromagnetism through hard PC method.
文摘Coherently driven atomic gases inside optical cavities hold great promise for generating rich dynam- ics and exotic states of matter. It was shown recently that. an exotic topological superradiant state exists in a two-component degenerate Fermi gas coupled to a cavity, where local order parameters coexist with global topological invariants. In this work, we characterize in detail various properties of this exotic state, focusing on the feedback interactions between the atoms and the cavity field. In particular, we demonstrate that cavity-induced interband coupling plays a crucial role in inducing the topological phase transition between the conventional and topological superradiant states. We analyze the interesting signatures in the cavity field left by the closing and reopening of the atomic bulk gap across the topological phase boundary and discuss the robustness of the topological superradiant state by investigating the steady-state phase diagram under various conditions. Furthermore, we consider the interaction effect and discuss the interplay between the pairing order in atomic ensembles and the superradiance of the cavity mode. Our work provides many valuable insights into the unique cavity-atom hybrid system under study and is helpful for future experimental exploration of the topological superradiant state.
基金supported by the National Key R&D Program of China (2016YFA0301601 and 2016YFA0301604)the National Natural Science Foundation of China (11674301, 11761161003, and 11625522)the Thousand-Young-Talent Program of China
文摘To investigate the band structure is one of the key approaches to study the fundamental properties of a novel material.We report here the precision band mapping of a 2-dimensional(2D) spin-orbit(SO) coupling in an optical lattice.By applying the microwave spin-injection spectroscopy, the band structure and spin-polarization distribution are achieved simultaneously.The band topology is also addressed with observing the band gap close and re-open at the Dirac points.Furthermore, the lattice depth and the Raman coupling strength are precisely calibrated with relative errors in the order of 10^(-3).Our approach could also be applied for exploring the exotic topological phases with even higher dimensional system.
基金supported by the Chinese Academy of Sciences Strategic Priority Research Program(XDB35020100)the National Key Research and Development Program of China(2021YFA1400900 and 2018YFA0305601)+3 种基金the National Natural Science Foundation of China(11874073,12304564,11825401,12204187,12261160368)the Open Project of Shenzhen Institute of Quantum Science and Engineering(SIQSE202003)the Hefei National Laboratorythe Scientific and Technological Innovation 2030 Key Program of Quantum Communication and Quantum Computing(2021ZD0301903 and 2021ZD0302000)。
文摘The realization of spin-orbit-coupled ultracold gases has driven a wide range of research and is typically based on the rotating wave approximation(RWA).By neglecting the counter-rotating terms,RWA characterizes a single near-resonant spin-orbit(SO)coupling in a two-level system.Here,we propose and experimentally realize a new scheme for achieving a pair of two-dimensional(2D)SO couplings for ultracold fermions beyond RWA.This work not only realizes the first anomalous Floquet topological Fermi gas beyond RWA,but also significantly improves the lifetime of the 2D-SO-coupled Fermi gas.Based on pump-probe quench measurements,we observe a deterministic phase relation between two sets of SO couplings,which is characteristic of our beyond-RWA scheme and enables the two SO couplings to be simultaneously tuned to the optimum 2D configurations.We observe intriguing band topology by measuring two-ring band-inversion surfaces,quantitatively consistent with a Floquet topological Fermi gas in the regime of high Chern numbers.Our study can open an avenue to explore exotic SO physics and anomalous topological states based on long-lived SO-coupled ultracold fermions.
基金supported by the National Natural Science Foundation of China(52071024,52271003,52101188)Guangdong Basic and Applied Basic Research Foundation(2020B1515120077)+4 种基金the Funds for Creative Research Groups of NSFC(51921001)the Projects of International Cooperation and Exchanges of NSFC(51961160729,52061135207)the 111 Project(BP0719004)the Program for Changjiang Scholars and Innovative Research Team in University of China(IRT_14R05)the Project funded by China Postdoctoral Science Foundation(2020M680009)。
