scholarly journals Absorption of diffusive spin current in surface and bulk states of a topological insulator

2017 ◽  
Vol 96 (21) ◽  
Author(s):  
Akiyo Nomura ◽  
Nariaki Nasaka ◽  
Takaharu Tashiro ◽  
Takao Sasagawa ◽  
Kazuya Ando
Keyword(s):  
Topological Insulator ◽  
Spin Current

scholarly journals Observation and control of the weak topological insulator state in ZrTe5

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Peng Zhang ◽  
Ryo Noguchi ◽  
Kenta Kuroda ◽  
Chun Lin ◽  
Kaishu Kawaguchi ◽  
...  
Keyword(s):  
Band Gap ◽  
Topological Insulator ◽  
Spin Current ◽  
Side Surface ◽  
Quantum Spin ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Dirac Semimetal ◽  
Topological States ◽  
The One ◽  
And Control

AbstractA quantum spin Hall (QSH) insulator hosts topological states at the one-dimensional (1D) edge, along which backscattering by nonmagnetic impurities is strictly prohibited. Its 3D analogue, a weak topological insulator (WTI), possesses similar quasi-1D topological states confined at side surfaces. The enhanced confinement could provide a route for dissipationless current and better advantages for applications relative to strong topological insulators (STIs). However, the topological side surface is usually not cleavable and is thus hard to observe. Here, we visualize the topological states of the WTI candidate ZrTe5 by spin and angle-resolved photoemission spectroscopy (ARPES): a quasi-1D band with spin-momentum locking was revealed on the side surface. We further demonstrate that the bulk band gap is controlled by external strain, realizing a more stable WTI state or an ideal Dirac semimetal (DS) state. The highly directional spin-current and the tunable band gap in ZrTe5 will provide an excellent platform for applications.

scholarly journals Conversion of spin current into charge current in a topological insulator: Role of the interface

2018 ◽  
Vol 97 (17) ◽  
Author(s):  
Rik Dey ◽  
Nitin Prasad ◽  
Leonard F. Register ◽  
Sanjay K. Banerjee
Keyword(s):  
Topological Insulator ◽  
Spin Current ◽  
Charge Current

scholarly journals Spin current generator based on topological insulator coupled to ferromagnetic insulators

AIP Advances ◽  
2012 ◽  
Vol 2 (3) ◽  
pp. 032162 ◽  
Author(s):  
M. J. Ma ◽  
M. B. A. Jalil ◽  
S. G. Tan ◽  
Y. Li ◽  
Z. B. Siu
Keyword(s):  
Topological Insulator ◽  
Spin Current ◽  
Current Generator

scholarly journals Inverse spin Hall effect in heterostructures “nanostructured ferromagnet/topological insulator”

2018 ◽  
Vol 185 ◽  
pp. 01005
Author(s):  
P.N. Petrov ◽  
M.D. Davydova ◽  
P.N. Skirdkov ◽  
K.A. Zvezdin ◽  
J.G. Lin ◽  
...  
Keyword(s):  
Hall Effect ◽  
Topological Insulator ◽  
Electronic Transport ◽  
Spin Current ◽  
Spin Hall Effect ◽  
Magnetization Dynamics ◽  
Micromagnetic Simulations ◽  
Dc Voltage ◽  
Spin Polarized ◽  
Inverse Spin Hall Effect

Interaction between magnetization dynamics and spin polarized electronic transport has been studied for ferromagnet nanodisk situated upon a 3D topological insulator (TI) film. Resonant magnetization dynamics leads to generation of spin current, which flows into the topological insulator, where spin to charge conversion occurs. Using micromagnetic simulations for magnetization dynamics we estimate the dc voltage, which is created due to this process in topological insulator. Contribution from different modes, which are characteristic for nanodisks, to the voltage was calculated.

scholarly journals Current-induced switching of proximity-induced ferromagnetic surface states in a topological insulator

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Masataka Mogi ◽  
Kenji Yasuda ◽  
Reika Fujimura ◽  
Ryutaro Yoshimi ◽  
Naoki Ogawa ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Spin Current ◽  
Surface States ◽  
Anomalous Hall Effect ◽  
Polarized Electrons ◽  
Electrical Control ◽  
Spin Polarized ◽  
Topological Current ◽  
Efficient Charge ◽  
Electrical Manipulation

AbstractElectrical manipulation of magnetization could be an essential function for energy-efficient spintronics technology. A magnetic topological insulator, possessing a magnetically gapped surface state with spin-polarized electrons, not only exhibits exotic topological phases relevant to the quantum anomalous Hall state but also enables the electrical control of its magnetic state at the surface. Here, we demonstrate efficient current-induced switching of the surface ferromagnetism in hetero-bilayers consisting of the topological insulator (Bi1-xSbx)2Te3 and the ferromagnetic insulator Cr2Ge2Te6, where the proximity-induced ferromagnetic surface states play two roles: efficient charge-to-spin current conversion and emergence of large anomalous Hall effect. The sign reversal of the surface ferromagnetic states with current injection is clearly observed, accompanying the nearly full magnetization reversal in the adjacent insulating Cr2Ge2Te6 layer of an optimal thickness range. The present results may facilitate an electrical control of dissipationless topological-current circuits.

Strongly enhanced spin current in topological insulator/ferromagnetic metal heterostructures by spin pumping

2015 ◽  
Vol 117 (17) ◽  
pp. 17D148 ◽  
Author(s):  
C. N. Wu ◽  
Y. H. Lin ◽  
Y. T. Fanchiang ◽  
H. Y. Hung ◽  
H. Y. Lin ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Spin Current ◽  
Ferromagnetic Metal ◽  
Spin Pumping
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