A5101721197- Topological Materials and Phenomena
- Magnetic properties of thin films
- Quantum and electron transport phenomena
- Graphene research and applications
- Advanced Condensed Matter Physics
- 2D Materials and Applications
- Physics of Superconductivity and Magnetism
- Diamond and Carbon-based Materials Research
- Iron-based superconductors research
- Phase-change materials and chalcogenides
University of Chinese Academy of Sciences
2019-2025
Chinese Academy of Sciences
2020-2025
Songshan Lake Materials Laboratory
2023-2025
Czech Academy of Sciences, Institute of Physics
2025
Institute of Physics
2019-2024
State Key Laboratory of Magnetism
2019-2023
Iowa State University
2018
Abstract Nonmagnetic Rashba systems with broken inversion symmetry are expected to exhibit nonreciprocal charge transport, a new paradigm of unidirectional magnetoresistance in the absence ferromagnetic layer. So far, most work on transport has been solely limited cryogenic temperatures, which is major obstacle for exploiting room-temperature two-terminal devices based such response. Here, we report behavior up room temperature semiconductor α-GeTe coexisting surface and bulk states. The...
Topological insulators (TIs) have emerged as some of the most efficient spin-to-charge convertors because their correlated spin-momentum locking at helical Dirac surface states. While endeavors been made to pursue large "charge-to-spin" conversions in novel TI materials using spin-torque-transfer geometries, reciprocal process "spin-to-charge" conversion, characterized by inverse Edelstein effect length (λIEE) prototypical material (Bi2Se3), remains moderate. Here, we demonstrate that,...
Abstract Single-particle band theory has been very successful in describing the structure of topological insulators. However, with decreasing thickness insulator thin films, single-particle is insufficient to explain their structures and transport properties due existence top bottom surface-state coupling. Here, we reconstruct this coupling an equivalently screened Coulomb interaction Bi 2 Se 3 ultrathin films. The thickness-dependent position Dirac point magnitude mass gap are discussed...
Ferroelectric Rashba semiconductors (FERSCs) have recently attracted intensive attention due to their giant bulk parameter, αR, which results in a locking between the spin degrees of freedom and switchable electric polarization. However, integration FERSCs into microelectronic devices has provoked questions concerning whether effect can persist when material thickness is reduced several nanometers. Here we find that αR keep large value 2.12 eV Å 5.0 nm thick GeTe film. The behavior with be...
The understanding and manipulation of anisotropic Gilbert damping is crucial for both fundamental research versatile engineering optimization. Although several works on have been reported, no direct relationship between the band structure was established. Here, we observed an in Fe/GeTe manipulated by symmetric structures GeTe via angle-resolved photoemission spectroscopy. Moreover, can be modified symmetry structures. Our Letter provides insightful understandings ferromagnets interfaced...
Abstract Emergent topological insulators (TIs) and their design are in high demand for manipulating transmitting spin information toward ultralow‐power‐consumption spintronic applications. Here, distinct states with tailored properties can be achieved a single reduced‐dimensional TI‐superlattice, (Bi 2 /Bi Se 3 )‐(Bi ) N or (□/Bi ( is the repeating unit, □ represents an empty layer) by controlling termination via molecular beam epitaxy. The Bi ‐terminated superlattice exhibits Dirac cone...
The elegant spin physics of Dirac electrons in topological insulators (TIs) have considerably endowed fertile tunability magnetic/TI heterojunction performance with modified spin-orbit effect engineering. Signatures proximate hybridization between magnetic states and surface been reported. However, the nature relaxation process these systems remains elusive. Here, we unambiguously demonstrate anisotropic a spin-orbit-hybridized $\mathrm{Fe}\text{/}{\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ system....
Dual topological insulators, simultaneously protected by time-reversal symmetry and crystalline symmetry, open great opportunities to explore different symmetry-protected metallic surface states. However, the conventional dual states located on facets hinder integration into planar opto-electronic/spintronic devices. Here, superlattices (TSLs) Bi2 Se3 -(Bi2 /Bi2 )N with limited stacking layer number N are constructed. Angle-resolved photoelectron emission spectra of TSLs identify coexistence...
$\ensuremath{\beta}\text{\ensuremath{-}}\mathrm{PdB}{\mathrm{i}}_{2}$ has attracted much attention for its prospective ability to possess simultaneously topological surface and superconducting states due unprecedented spin-orbit interaction (SOC). Whereas most works have focused solely on investigating states, the coupling between spin charge degrees of freedom in this class quantum material remains unexplored. Here, we report a study spin-to-charge conversion ultrathin film grown by...
Topological insulators (TIs) with distinct topological surface states (TSSs) have served as fertile ground to investigate spintronics and quantum information devices. Spin transport properties of ferromagnet (FM)/TI heterostructures been revealed due the spin-momentum-locked TSS. The role TSS on laser-induced ultrafast spin dynamics, however, is not well understood. Here, we find that can only significantly accelerate demagnetization but also enhance Gilbert damping factor...
Magnetically doped topological insulators (TIs) attract a great deal of interest for both fundamental scientific studies and potential applications. These systems are promising the realization quantum anomalous Hall effect, more generally, potentially controllable magnetism, which can underlay many useful technological Here, we reveal first photoinduced magnetization dynamics in 40 nm thin film magnetically TIs, CrxBi2-xTe3 with x=0.29 using femtosecond time-resolved magneto-optical Kerr...