scholarly journals Strong spin-dephasing in a topological insulator-paramagnet heterostructure

APL Materials ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 091113 ◽  
Author(s):  
Jason Lapano ◽  
Alessandro R. Mazza ◽  
Haoxiang Li ◽  
Debangshu Mukherjee ◽  
Elizabeth M. Skoropata ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Spin Dephasing ◽  
Strong Spin

scholarly journals Irreversible Thermodynamics at Surfaces: Inverse Edelstein Effect for Topological Insulator

2021 ◽  
Author(s):  
Wayne M. Saslow
Keyword(s):  
Topological Insulator ◽  
Three Dimensional ◽  
Irreversible Thermodynamics ◽  
Orbit Coupling ◽  
Spin Accumulation ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Charge Current ◽  
Flux Incident ◽  
Strong Spin

We employ Onsager’s irreversible thermodynamics (IrTh) to study the Inverse Edelstein effect (IEE) for a non-magnetic material (NM) adjacent to a topological insulator (TI) with a strong spin-orbit interaction. The TI surface state region is treated as quasi two-dimensional (2d). For the IEE, the source is a 3d spin flux incident from the NM that converts, at the NM/TI interface, to a quasi-2d charge current in the TI. For the Edelstein Effect (EE), the source is a quasi-2d charge flux incident from the TI that converts, at the interface, to a three-dimensional (3d) spin flux in the NM. For strong spin-orbit coupling, as considered here, when the 3d spin flux crosses to the 2d TI, the quasi-2d charge current is produced along with a quasi-2d spin accumulation. (For weak spin-orbit coupling, production of charge current and of spin accumulation are distinct processes.) We compute the associated rates of heating.

scholarly journals Strong spin-orbit fields and Dyakonov-Perel spin dephasing in supported metallic films

2016 ◽  
Vol 94 (18) ◽  
Author(s):  
Nguyen H. Long ◽  
Phivos Mavropoulos ◽  
David S. G. Bauer ◽  
Bernd Zimmermann ◽  
Yuriy Mokrousov ◽  
...  
Keyword(s):  
Spin Orbit ◽  
Metallic Films ◽  
Spin Dephasing ◽  
Strong Spin

Magnetic and Electronic Properties of Gd-Doped Topological Insulator Bi1.09Gd0.06Sb0.85Te3

2019 ◽  
Vol 129 (3) ◽  
pp. 404-412 ◽  
Author(s):  
S. O. Filnov ◽  
Yu. A. Surnin ◽  
A. V. Koroleva ◽  
I. I. Klimovskikh ◽  
D. A. Estyunin ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Topological Insulator

scholarly journals Observation of chiral surface excitons in a topological insulator Bi2Se3

2019 ◽  
Vol 116 (10) ◽  
pp. 4006-4011 ◽  
Author(s):  
H.-H. Kung ◽  
A. P. Goyal ◽  
D. L. Maslov ◽  
X. Wang ◽  
A. Lee ◽  
...  
Keyword(s):  
Polarized Light ◽  
Orbit Coupling ◽  
Experimental Investigations ◽  
Composite Particles ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Excitation Energies ◽  
Circularly Polarized Light ◽  
Pl Emission ◽  
Strong Spin

The protected electron states at the boundaries or on the surfaces of topological insulators (TIs) have been the subject of intense theoretical and experimental investigations. Such states are enforced by very strong spin–orbit interaction in solids composed of heavy elements. Here, we study the composite particles—chiral excitons—formed by the Coulomb attraction between electrons and holes residing on the surface of an archetypical 3D TI,Bi2Se3. Photoluminescence (PL) emission arising due to recombination of excitons in conventional semiconductors is usually unpolarized because of scattering by phonons and other degrees of freedom during exciton thermalization. On the contrary, we observe almost perfectly polarization-preserving PL emission from chiral excitons. We demonstrate that the chiral excitons can be optically oriented with circularly polarized light in a broad range of excitation energies, even when the latter deviate from the (apparent) optical band gap by hundreds of millielectronvolts, and that the orientation remains preserved even at room temperature. Based on the dependences of the PL spectra on the energy and polarization of incident photons, we propose that chiral excitons are made from massive holes and massless (Dirac) electrons, both with chiral spin textures enforced by strong spin–orbit coupling. A theoretical model based on this proposal describes quantitatively the experimental observations. The optical orientation of composite particles, the chiral excitons, emerges as a general result of strong spin–orbit coupling in a 2D electron system. Our findings can potentially expand applications of TIs in photonics and optoelectronics.

scholarly journals Anomalous Hall effect in a magnetically extended topological insulator heterostructure

2020 ◽  
Vol 4 (9) ◽  
Author(s):  
Nan Liu ◽  
Xuefan Niu ◽  
Yuxin Liu ◽  
Qinghua Zhang ◽  
Lin Gu ◽  
...  
Keyword(s):  
Hall Effect ◽  
Topological Insulator ◽  
Anomalous Hall Effect

scholarly journals The impact of metallic contacts on spin-polarized photocurrents in topological insulator Bi 2 Se 3 nanowires

2020 ◽  
Vol 117 (26) ◽  
pp. 262401
Author(s):  
N. Meyer ◽  
K. Geishendorf ◽  
J. Walowski ◽  
A. Thomas ◽  
M. Münzenberg
Keyword(s):  
Topological Insulator ◽  
Metallic Contacts ◽  
Spin Polarized ◽  
The Impact

Ultraviolet wavefront manipulation using topological insulator metasurfaces based on geometric phase

2021 ◽  
Vol 487 ◽  
pp. 126812
Author(s):  
Mingli Wan ◽  
Pengfei Ji ◽  
Rongrong Wang ◽  
Xiaopeng Zhang ◽  
Mingli Tian ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Geometric Phase

scholarly journals Moiré superlattice on the surface of a topological insulator

2021 ◽  
Vol 103 (15) ◽  
Author(s):  
Jennifer Cano ◽  
Shiang Fang ◽  
J. H. Pixley ◽  
Justin H. Wilson
Keyword(s):  
Topological Insulator
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