Circular aptamers are promising candidates for analytical and therapeutic applications due to their enhanced biological and structural stability.However,the process of circular aptamer selection remains a great challe...Circular aptamers are promising candidates for analytical and therapeutic applications due to their enhanced biological and structural stability.However,the process of circular aptamer selection remains a great challenge,as it requires multiple rounds of binding-separation-amplification that involves issues with nonspecific binding and amplification bias.Here,we develop a highly practical solution for reliable selection of circular aptamers in a single round based on magnetosome-like magnetic chain cross-linked graphene oxide(separation efficiency≈105).High-affinity aptamer candidates can be rapidly selected from a preenriched circular DNA library,while low-affinity candidates are effectively adsorbed and separated by magnetosome-like magnetic chain cross-linked graphene oxide.With lipopolysaccharide as a representative model,the single-round selected lipopolysaccharide circular aptamer has been identified to have a high binding affinity with a Kd value of low to nanomolar range.Using this method,circular aptamers for protein and small-molecule targets were also successfully generated.We envision that this approach will accelerate the discovery of various new circular aptamers and open up a new avenue for analytical and therapeutic studies.展开更多
Magnetic/superconducting heterostructures have attracted significant attention due to their potential to host topological superconductivity and Majorana zero modes.In this study,we report the growth of CrTe_(2)ultrath...Magnetic/superconducting heterostructures have attracted significant attention due to their potential to host topological superconductivity and Majorana zero modes.In this study,we report the growth of CrTe_(2)ultrathin films on NbSe_(2)substrates through molecular beam epitaxy.Structural characterization revealed an initial epitaxial stabilization of a compressed Cr-Te layer,with subsequent annealing inducing a periodic stress-relief reconstruction that exhibits controllable nanoscale periodicity.Scanning tunneling spectroscopy measurements unveiled edge-localized magnetic moments.This system provides a novel platform for constructing one-dimensional magnetic chains through strain-modulated self-assembly,while simultaneously offering an atomically precise interface between magnetic and superconducting orders.Our findings advance the prospects for designing the heterostructures in topological quantum devices.展开更多
The self-assembly of polyalcohol ligand 1,1,1-tris（hydroxymethyl）ethane with Dy（NO3）3· 6H2 O and Cr3O-Bzo-t-Bu precursor in the presence of triethylamine step-by-step generated a heterometallic 3d–4f chain. ...The self-assembly of polyalcohol ligand 1,1,1-tris（hydroxymethyl）ethane with Dy（NO3）3· 6H2 O and Cr3O-Bzo-t-Bu precursor in the presence of triethylamine step-by-step generated a heterometallic 3d–4f chain. Magnetic investigation of the complex indicates typical slow relaxation of the magnetization at low temperature.展开更多
We consider an entangled Ising-XY Z diamond chain structure. Quantum correlations for this model are inves- tigated by using quantum discord and trace distance discord. Quantum correlations are obtained for different ...We consider an entangled Ising-XY Z diamond chain structure. Quantum correlations for this model are inves- tigated by using quantum discord and trace distance discord. Quantum correlations are obtained for different values of the anisotropy parameter, magnetic field and temperature. By comparison between quantum correlations, we show that the trace distance discord is always larger than quantum discord. Finally, some novel effects such as increasing the quantum correlations with temperature and constructive role of anisotropy parameter, which may play to the quantum correlations, are observed.展开更多
Magnon spin currents in insulating magnets are useful for low-power spintronics. However, in magnets stacked by antiferromagnetic(AFM) exchange coupling, which have recently aroused significant interest for potential ...Magnon spin currents in insulating magnets are useful for low-power spintronics. However, in magnets stacked by antiferromagnetic(AFM) exchange coupling, which have recently aroused significant interest for potential applications in spintronics, Bose–Einstein distribution populates magnon states across all energies from opposite eigenmodes, and hence the magnon spin current is largely compensated. Contrary to this common observation,here, we show that magnets with X-type AFM stacking, where opposite magnetic sublattices form orthogonal intersecting chains, support giant magnon spin currents with minimal compensation. Our model Hamiltonian calculations predict magnetic chain locking of magnon spin currents in these X-type magnets, significantly reducing their compensation ratio. In addition, the one-dimensional nature of the chain-like magnetic sublattices enhances magnon spin conductivities surpassing those of two-dimensional ferromagnets and canonical altermagnets. Notably, uncompensated X-type magnets, such as odd-layer antiferromagnets and ferrimagnets, can exhibit magnon spin currents polarized opposite to those expected by their net magnetization. These unprecedented properties of X-type magnets, combined with their inherent advantages resulting from AFM coupling, offer a promising new path for low-power high-performance spintronics.展开更多
Using Bu4N[Fe(Tp*)(CN)3]- (Tp* = hydrotris(3,5-dimethylpyrazol-l-yl)borate) as the building block to react with Cun and N-methylimidazole, we obtained a one-dimensional (1D) beterobimetallic cyano-bridged chain, [Fe(T...Using Bu4N[Fe(Tp*)(CN)3]- (Tp* = hydrotris(3,5-dimethylpyrazol-l-yl)borate) as the building block to react with Cun and N-methylimidazole, we obtained a one-dimensional (1D) beterobimetallic cyano-bridged chain, [Fe(Tp*)(CN)3]2Cu(N- methylimidazole)2.2H20 (1). The crystal structures and magnetic studies demonstrate that complex 1 exhibits slow relaxation of the magnetization due to strong intrachain ferromagnetic coupling and weak interchain interactions.展开更多
A Ni(Ⅱ)coordination complex 1 with a novel boron-oxamido radical ligand was synthesized and isolated.Reactions of 1 with N,N-dimethyl-4-pyridinamine(DMAP)and 4,4'-bpy resulted in 2 and 3,respectively,accompanied ...A Ni(Ⅱ)coordination complex 1 with a novel boron-oxamido radical ligand was synthesized and isolated.Reactions of 1 with N,N-dimethyl-4-pyridinamine(DMAP)and 4,4'-bpy resulted in 2 and 3,respectively,accompanied by the spin state transition from S=1/2 to S=3/2.Both 2 and 3 were isolated as stable crystals and characterized to feature an S=3/2 spin state,with the S=1 Ni(Ⅱ)atoms ferromagnetically coupled with the ligand-centred radicals,by SQUID measurement and EPR spectroscopy.Complex 3 represents the first example of one-dimensional magnetic chain constructed by S=3/2 Ni(Ⅱ)-radical units.展开更多
基金supported by the National Natural Science Foundation of China(22104028,32072306,and U23A20265).
文摘Circular aptamers are promising candidates for analytical and therapeutic applications due to their enhanced biological and structural stability.However,the process of circular aptamer selection remains a great challenge,as it requires multiple rounds of binding-separation-amplification that involves issues with nonspecific binding and amplification bias.Here,we develop a highly practical solution for reliable selection of circular aptamers in a single round based on magnetosome-like magnetic chain cross-linked graphene oxide(separation efficiency≈105).High-affinity aptamer candidates can be rapidly selected from a preenriched circular DNA library,while low-affinity candidates are effectively adsorbed and separated by magnetosome-like magnetic chain cross-linked graphene oxide.With lipopolysaccharide as a representative model,the single-round selected lipopolysaccharide circular aptamer has been identified to have a high binding affinity with a Kd value of low to nanomolar range.Using this method,circular aptamers for protein and small-molecule targets were also successfully generated.We envision that this approach will accelerate the discovery of various new circular aptamers and open up a new avenue for analytical and therapeutic studies.
基金NSFC(Grants No.12488101,92365302,12474156,22325203,52102336,12474121)the Ministry of Science and Technology of China(Grants No.2020YFA0309000,2024YFA1410100)+2 种基金the Science and Technology Commission of Shanghai Municipality(Grants No.2019SHZDZX01,20QA1405100,24LZ1401000)Cultivation Project of Shanghai Research Center for Quantum Sciences(Grant No.LZPY2024-04)innovation program for Quantum Science and Technology(Grant No.2021ZD0302500)for financial support.
文摘Magnetic/superconducting heterostructures have attracted significant attention due to their potential to host topological superconductivity and Majorana zero modes.In this study,we report the growth of CrTe_(2)ultrathin films on NbSe_(2)substrates through molecular beam epitaxy.Structural characterization revealed an initial epitaxial stabilization of a compressed Cr-Te layer,with subsequent annealing inducing a periodic stress-relief reconstruction that exhibits controllable nanoscale periodicity.Scanning tunneling spectroscopy measurements unveiled edge-localized magnetic moments.This system provides a novel platform for constructing one-dimensional magnetic chains through strain-modulated self-assembly,while simultaneously offering an atomically precise interface between magnetic and superconducting orders.Our findings advance the prospects for designing the heterostructures in topological quantum devices.
基金supported by the NSF of China(Nos.21031002,21421001)Natural Science Fund of Tianjin,China(No.15JCZDJC38800)
文摘The self-assembly of polyalcohol ligand 1,1,1-tris（hydroxymethyl）ethane with Dy（NO3）3· 6H2 O and Cr3O-Bzo-t-Bu precursor in the presence of triethylamine step-by-step generated a heterometallic 3d–4f chain. Magnetic investigation of the complex indicates typical slow relaxation of the magnetization at low temperature.
基金Supported by the Azerbaijan Shahid Madani University
文摘We consider an entangled Ising-XY Z diamond chain structure. Quantum correlations for this model are inves- tigated by using quantum discord and trace distance discord. Quantum correlations are obtained for different values of the anisotropy parameter, magnetic field and temperature. By comparison between quantum correlations, we show that the trace distance discord is always larger than quantum discord. Finally, some novel effects such as increasing the quantum correlations with temperature and constructive role of anisotropy parameter, which may play to the quantum correlations, are observed.
基金supported by the National Key R&D Program of China (Grant No.2022YFA1403203)the National Natural Science Funds for Distinguished Young Scholar (Grant No.52325105)+2 种基金the National Natural Science Foundation of China (Grant Nos.12274411,12241405,52250418,and12404185)the Basic Research Program of the Chinese Academy of Sciences (CAS) Based on Major Scientific Infrastructures (Grant No.JZHKYPT-2021-08)the CAS Project for Young Scientists in Basic Research (Grant No.YSBR-084)。
文摘Magnon spin currents in insulating magnets are useful for low-power spintronics. However, in magnets stacked by antiferromagnetic(AFM) exchange coupling, which have recently aroused significant interest for potential applications in spintronics, Bose–Einstein distribution populates magnon states across all energies from opposite eigenmodes, and hence the magnon spin current is largely compensated. Contrary to this common observation,here, we show that magnets with X-type AFM stacking, where opposite magnetic sublattices form orthogonal intersecting chains, support giant magnon spin currents with minimal compensation. Our model Hamiltonian calculations predict magnetic chain locking of magnon spin currents in these X-type magnets, significantly reducing their compensation ratio. In addition, the one-dimensional nature of the chain-like magnetic sublattices enhances magnon spin conductivities surpassing those of two-dimensional ferromagnets and canonical altermagnets. Notably, uncompensated X-type magnets, such as odd-layer antiferromagnets and ferrimagnets, can exhibit magnon spin currents polarized opposite to those expected by their net magnetization. These unprecedented properties of X-type magnets, combined with their inherent advantages resulting from AFM coupling, offer a promising new path for low-power high-performance spintronics.
基金financial support from the National Natural Science Foundation of China (21101021, 91122031)
文摘Using Bu4N[Fe(Tp*)(CN)3]- (Tp* = hydrotris(3,5-dimethylpyrazol-l-yl)borate) as the building block to react with Cun and N-methylimidazole, we obtained a one-dimensional (1D) beterobimetallic cyano-bridged chain, [Fe(Tp*)(CN)3]2Cu(N- methylimidazole)2.2H20 (1). The crystal structures and magnetic studies demonstrate that complex 1 exhibits slow relaxation of the magnetization due to strong intrachain ferromagnetic coupling and weak interchain interactions.
基金the National Key R&D Program of China(Grant 2018YFA0306004)the National Natural Science Foundation of China(Grant 21525102)for financial support.
文摘A Ni(Ⅱ)coordination complex 1 with a novel boron-oxamido radical ligand was synthesized and isolated.Reactions of 1 with N,N-dimethyl-4-pyridinamine(DMAP)and 4,4'-bpy resulted in 2 and 3,respectively,accompanied by the spin state transition from S=1/2 to S=3/2.Both 2 and 3 were isolated as stable crystals and characterized to feature an S=3/2 spin state,with the S=1 Ni(Ⅱ)atoms ferromagnetically coupled with the ligand-centred radicals,by SQUID measurement and EPR spectroscopy.Complex 3 represents the first example of one-dimensional magnetic chain constructed by S=3/2 Ni(Ⅱ)-radical units.
