Molecular spintronics is an emerging field which evoked wide research attention since the first molecule-based spintronic device has been reported at 2002. Due to the active study over the last few years, it is found ...Molecular spintronics is an emerging field which evoked wide research attention since the first molecule-based spintronic device has been reported at 2002. Due to the active study over the last few years, it is found that the interfaces in spintronic device, so called spinterface, is of critical importance for many key issues in molecular spintronics, such as enhancing spin injection, lengthening spin transport distance, as well as manipulating spin signals in molecular spintronic devices. Here in this review, recent studies regarding spinterface in molecular devices, especially those impressive efforts devoted on spin manipulation, have been systematically summarized and discussed.展开更多
We theoretically explore the manipulation of a temporal electron-spin splitter by aδ-potential in an embedded magnetic-elec tric-barrier micro structure(EMEBM),which is constructed by patterning a ferromagnetic strip...We theoretically explore the manipulation of a temporal electron-spin splitter by aδ-potential in an embedded magnetic-elec tric-barrier micro structure(EMEBM),which is constructed by patterning a ferromagnetic stripe and a Schottky-metal stripe on the top and bottom of an InAs/Al_(x)In_(1-x)As heterostructure,respectively.Spin polarization of the dwell time remains,even though aδ-potential is inserted by atomic-layer doping.Both the magnitude and sign of the spinpolarized dwell time can be manipulated by changing the weight or position of the 6-potential.Thus,a structurally controllable temporal electron-spin splitter can be obtained for spintronics device applications.展开更多
The magnetic dynamics of a thin Co_(2)FeAl film epitaxially grown on GaAs substrate was investigated using the timeresolved magneto-optical Kerr measurement under an out-of-plane external field.The intrinsic magnetic ...The magnetic dynamics of a thin Co_(2)FeAl film epitaxially grown on GaAs substrate was investigated using the timeresolved magneto-optical Kerr measurement under an out-of-plane external field.The intrinsic magnetic damping constant,which should do not vary with the external magnetic field,exhibits an abnormal huge increase when the precession frequency is tuned to be resonant with that of the coherent longitudinal acoustic phonon in the Co_(2)FeAl/GaAs heterostructure.The experimental finding is suggested to result from the strong coherent energy transfer from spins to acoustic phonons via magnetoelastic effect under a resonant coupling condition,which leads to a huge energy dissipation of spins and a greatly enhanced magnetic damping in Co_(2)FeAl.Our experimental findings provide an experimental evidence of spin pumping-like effect driven by propagating acoustic phonons via magnetoelastic effect,suggesting an alternative approach to the possible long-range spin manipulation via coherent acoustic waves.展开更多
Advances in information processing technologies rely fundamentally on the ability to manipulate,convey,and discern the information carriers[1].Topological spin textures,prized for robustness,tunability,and low energy ...Advances in information processing technologies rely fundamentally on the ability to manipulate,convey,and discern the information carriers[1].Topological spin textures,prized for robustness,tunability,and low energy consumption,are promising information carriers for next-generation spintronic technologies.Current research,like racetrack memories and logic gates[2,3],focused on manipulating spin textures via electrons/photons,while leveraging spin textures to control electrons/photons in semiconductors remains scarce.展开更多
Electron spin qubits[1]in Si have attracted wide attention as potentially viable building blocks for a scalable quantum computer,as illustrated by recent experiments showing highfidelity single-qubit and two-qubit gat...Electron spin qubits[1]in Si have attracted wide attention as potentially viable building blocks for a scalable quantum computer,as illustrated by recent experiments showing highfidelity single-qubit and two-qubit gates[1-4].With magnetic interactions relatively weak and difficult to control,the prevailing means for spin manipulation has been through electrically controlled top gates on the semiconductor heterostructures,helped by a nearby micromagnet and the magnetic field gradient it induces,which leads to an artificial spin-orbit coupling[5].展开更多
Spin photonics revolutionizes photonic technology by enabling precise manipulation of photon spin states,with spindecoupled metasurfaces emerging as pivotal in complex optical field manipulation.Here,we propose a fold...Spin photonics revolutionizes photonic technology by enabling precise manipulation of photon spin states,with spindecoupled metasurfaces emerging as pivotal in complex optical field manipulation.Here,we propose a folded-path metasurface concept that enables independent dispersion and phase control of two opposite spin states,effectively overcoming the limitations of spin photonics in achieving broadband decoupling and higher integration levels.This advanced dispersion engineering is achieved by modifying the equivalent length of a folded path,generated by a virtual reflective surface,in contrast to previous methods that depended on effective refractive index control by altering structural geometries.Our approach unlocks previously unattainable capabilities,such as achieving achromatic focusing and achromatic spin Hall effect using the rotational degree of freedom,and generating spatiotemporal vector optical fields with only a single metasurface.This advancement substantially broadens the potential of metasurface-based spin photonics,extending its applications from the spatial domain to the spatiotemporal domain.展开更多
Manipulating the spin and valley degrees of freedom of electrons is crucial for next-generation information technologies.Altermagnets,as an emerging magnetic phase,provide a quantum platform with intrinsic spin-valley...Manipulating the spin and valley degrees of freedom of electrons is crucial for next-generation information technologies.Altermagnets,as an emerging magnetic phase,provide a quantum platform with intrinsic spin-valley locking,enabling multi-state manipulation of both spin and valley.Here,we propose a Janus monolayer CaCoFeN_(2),achieved through in situ substitution of magnetic transition metal atoms in the two-dimensional(2D)altermagnet Ca(CoN)2[Phys.Rev.Lett.133,056401(2024)].Our first-principles calculations identify CaCoFeN_(2) as an anisotropic spin-plasmon ferrovalley semiconductor,with a large valley splitting of 273 meV solely through crystal symmetry breaking,without any involvement of spin-orbit coupling(SOC).Furthermore,its anisotropic electronic structures facilitate highly directional spin plasmon propagation.Carrier-type switching(n-type↔ptype)reverses the anisotropy along orthogonal axes,yielding open equi-frequency contours in n-type CaCoFeN_(2).The integration of spontaneous spin and valley polarization within a single material without SOC,offers new opportunities for advancements in spintronics and valleytronics.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.21673059)the Funds from Ministry of Science and Technology of China(Grant Nos.2017YFA0206600 and 2016YFA0200700)+1 种基金the Instrument Development Project of Chinese Academy of Sciences(Grant No.YJKYYQ20170037)the CAS Pioneer Hundred Talents Program
文摘Molecular spintronics is an emerging field which evoked wide research attention since the first molecule-based spintronic device has been reported at 2002. Due to the active study over the last few years, it is found that the interfaces in spintronic device, so called spinterface, is of critical importance for many key issues in molecular spintronics, such as enhancing spin injection, lengthening spin transport distance, as well as manipulating spin signals in molecular spintronic devices. Here in this review, recent studies regarding spinterface in molecular devices, especially those impressive efforts devoted on spin manipulation, have been systematically summarized and discussed.
基金supported by the Science and Technology Innovation Plan Project of Hunan Province in China(S2019JJQNJJ2177)the National Natural Science Foundation of China(11864009)。
文摘We theoretically explore the manipulation of a temporal electron-spin splitter by aδ-potential in an embedded magnetic-elec tric-barrier micro structure(EMEBM),which is constructed by patterning a ferromagnetic stripe and a Schottky-metal stripe on the top and bottom of an InAs/Al_(x)In_(1-x)As heterostructure,respectively.Spin polarization of the dwell time remains,even though aδ-potential is inserted by atomic-layer doping.Both the magnitude and sign of the spinpolarized dwell time can be manipulated by changing the weight or position of the 6-potential.Thus,a structurally controllable temporal electron-spin splitter can be obtained for spintronics device applications.
基金This work was supported by the National Key R&D Program of China(No.2017YFB0405700)National Natural Science Foundation of China(No.12074370).
文摘The magnetic dynamics of a thin Co_(2)FeAl film epitaxially grown on GaAs substrate was investigated using the timeresolved magneto-optical Kerr measurement under an out-of-plane external field.The intrinsic magnetic damping constant,which should do not vary with the external magnetic field,exhibits an abnormal huge increase when the precession frequency is tuned to be resonant with that of the coherent longitudinal acoustic phonon in the Co_(2)FeAl/GaAs heterostructure.The experimental finding is suggested to result from the strong coherent energy transfer from spins to acoustic phonons via magnetoelastic effect under a resonant coupling condition,which leads to a huge energy dissipation of spins and a greatly enhanced magnetic damping in Co_(2)FeAl.Our experimental findings provide an experimental evidence of spin pumping-like effect driven by propagating acoustic phonons via magnetoelastic effect,suggesting an alternative approach to the possible long-range spin manipulation via coherent acoustic waves.
基金supported by the National Key Research and Development Program of China(2022YFB3605604)the National Natural Science Foundation of China(62274139,61974123,62304188,62374143,and 62374144)+2 种基金the Natural Science Foundation of Fujian Province(2025J011001)the Basic Research Funds for Central Universities(20720220025)the Grants-in-Aid for Scientific Research from JSPS KAKENHI(JP25K17939 and JP20F20363).
文摘Advances in information processing technologies rely fundamentally on the ability to manipulate,convey,and discern the information carriers[1].Topological spin textures,prized for robustness,tunability,and low energy consumption,are promising information carriers for next-generation spintronic technologies.Current research,like racetrack memories and logic gates[2,3],focused on manipulating spin textures via electrons/photons,while leveraging spin textures to control electrons/photons in semiconductors remains scarce.
文摘Electron spin qubits[1]in Si have attracted wide attention as potentially viable building blocks for a scalable quantum computer,as illustrated by recent experiments showing highfidelity single-qubit and two-qubit gates[1-4].With magnetic interactions relatively weak and difficult to control,the prevailing means for spin manipulation has been through electrically controlled top gates on the semiconductor heterostructures,helped by a nearby micromagnet and the magnetic field gradient it induces,which leads to an artificial spin-orbit coupling[5].
基金supported by the National Key Research and Development Program of China(2023YFB2805800)the National Natural Science Foundation of China(62175242 and U20A20217).
文摘Spin photonics revolutionizes photonic technology by enabling precise manipulation of photon spin states,with spindecoupled metasurfaces emerging as pivotal in complex optical field manipulation.Here,we propose a folded-path metasurface concept that enables independent dispersion and phase control of two opposite spin states,effectively overcoming the limitations of spin photonics in achieving broadband decoupling and higher integration levels.This advanced dispersion engineering is achieved by modifying the equivalent length of a folded path,generated by a virtual reflective surface,in contrast to previous methods that depended on effective refractive index control by altering structural geometries.Our approach unlocks previously unattainable capabilities,such as achieving achromatic focusing and achromatic spin Hall effect using the rotational degree of freedom,and generating spatiotemporal vector optical fields with only a single metasurface.This advancement substantially broadens the potential of metasurface-based spin photonics,extending its applications from the spatial domain to the spatiotemporal domain.
基金supported by theNationalNatural Science Foundation ofChina(No.12474172)the Taishan Scholar Program of Shandong Province(No.ts20190906).
文摘Manipulating the spin and valley degrees of freedom of electrons is crucial for next-generation information technologies.Altermagnets,as an emerging magnetic phase,provide a quantum platform with intrinsic spin-valley locking,enabling multi-state manipulation of both spin and valley.Here,we propose a Janus monolayer CaCoFeN_(2),achieved through in situ substitution of magnetic transition metal atoms in the two-dimensional(2D)altermagnet Ca(CoN)2[Phys.Rev.Lett.133,056401(2024)].Our first-principles calculations identify CaCoFeN_(2) as an anisotropic spin-plasmon ferrovalley semiconductor,with a large valley splitting of 273 meV solely through crystal symmetry breaking,without any involvement of spin-orbit coupling(SOC).Furthermore,its anisotropic electronic structures facilitate highly directional spin plasmon propagation.Carrier-type switching(n-type↔ptype)reverses the anisotropy along orthogonal axes,yielding open equi-frequency contours in n-type CaCoFeN_(2).The integration of spontaneous spin and valley polarization within a single material without SOC,offers new opportunities for advancements in spintronics and valleytronics.
