scholarly journals Hosting of surface states in spin–orbit induced projected bulk band gaps of W(1 1 0) and Ir(1 1 1)

2017 ◽  
Vol 29 (25) ◽  
pp. 255001 ◽  
Author(s):  
H J Elmers ◽  
D Kutnyakhov ◽  
S V Chernov ◽  
K Medjanik ◽  
O Fedchenko ◽  
...  
Keyword(s):  
Surface States ◽  
Band Gaps ◽  
Spin Orbit ◽  
Bulk Band

scholarly journals Interplay of spin–orbit coupling and lattice distortion in metal substituted 3D tri-chloride hybrid perovskites

2015 ◽  
Vol 3 (17) ◽  
pp. 9232-9240 ◽  
Author(s):  
C. Katan ◽  
L. Pedesseau ◽  
M. Kepenekian ◽  
A. Rolland ◽  
J. Even
Keyword(s):  
Lattice Distortion ◽  
Band Gaps ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Many Body ◽  
Structural Distortions ◽  
Many Body Effects

Metal and halogen substitution in hybrid perovskites reveals the interplay between spin–orbit coupling, structural distortions and many-body effects controlling band-gaps.

A broadband, self-biased photodiode based on antimony telluride (Sb2Te3) nanocrystals/silicon heterostructures

Nanoscale ◽  
2018 ◽  
Vol 10 (31) ◽  
pp. 15003-15009 ◽  
Author(s):  
Asish Parbatani ◽  
Eui Sang Song ◽  
Fan Yang ◽  
Bin Yu
Keyword(s):  
Topological Insulators ◽  
Electronic States ◽  
Band Gaps ◽  
Antimony Telluride ◽  
Next Generation ◽  
Conductive Surface ◽  
Silicon Heterostructures ◽  
Bulk Band

Low bulk band gaps and conductive surface electronic states of tetradymite topological insulators (TTI) make them potential candidates for next generation ultra-broadband photodevices.

scholarly journals Absence of the Rashba Splitting of Au(111) Surface Bands

2018 ◽  
Vol 2018 ◽  
pp. 1-5
Author(s):  
I. N. Yakovkin
Keyword(s):  
Electronic Structure ◽  
Dft Calculations ◽  
Surface States ◽  
Orbit Coupling ◽  
Spin Splitting ◽  
Inversion Symmetry ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Relativistic Approximation ◽  
Photoemission Experiment

The electronic structure of Au(111) films is studied by means of relativistic DFT calculations. It is found that the twinning of the surface bands, observed in photoemission experiment, does not necessarily correspond to the spin-splitting of the surface states caused by the break of the inversion symmetry at the surface. The twinning of the bands of clean Au(111) films can be obtained within nonrelativistic or scalar-relativistic approximation, so that it is not a result of spin-orbit coupling. However, the spin-orbit coupling does not lead to the spin-splitting of the surface bands. This result is explained by Kramers’ degeneracy, which means that the existence of a surface itself does not destroy the inversion symmetry of the system. The inversion symmetry of the Au(111) film can be broken, for example, by means of adsorption, and a hydrogen monolayer deposited on one face of the film indeed leads to the appearance of the spin-splitting of the bands.

scholarly journals Spin‐Orbit Torque Switching of a Nearly Compensated Ferrimagnet by Topological Surface States

2019 ◽  
Vol 31 (35) ◽  
pp. 1901681 ◽  
Author(s):  
Hao Wu ◽  
Yong Xu ◽  
Peng Deng ◽  
Quanjun Pan ◽  
Seyed Armin Razavi ◽  
...  
Keyword(s):  
Surface States ◽  
Spin Orbit ◽  
Topological Surface

A Model Photoemission Calculations Using Projection Operator Method

2003 ◽  
Vol 17 (15) ◽  
pp. 2897-2902
Author(s):  
B. Zoliana ◽  
Zaithanzauva Pachuau ◽  
Lalthakimi Zadeng ◽  
R. K. Thapa ◽  
P. K. Patra ◽  
...  
Keyword(s):  
Group Theory ◽  
Band Structure ◽  
Projection Operator ◽  
Surface States ◽  
Operator Method ◽  
Band Structure Calculations ◽  
Projection Operator Method ◽  
Structure Calculations ◽  
Bulk Band

We have shown in this report the application of projection operator method of group theory in deriving the wavefunctions for the surface state in Cu(110) which had been used in calculating photocurrent. This approach gives a qualitative characterization of surface states simply on the basis of existing bulk-band structure calculations.

Spintronics Based on Topological Insulators

SPIN ◽  
2016 ◽  
Vol 06 (02) ◽  
pp. 1640001 ◽  
Author(s):  
Yabin Fan ◽  
Kang L. Wang
Keyword(s):  
Topological Insulators ◽  
Spin Injection ◽  
Surface States ◽  
Research Field ◽  
Spin Torque ◽  
Spin Orbit ◽  
Challenges And Opportunities ◽  
Potential Applications ◽  
Topological Surface ◽  
A Charge

Spintronics using topological insulators (TIs) as strong spin–orbit coupling (SOC) materials have emerged and shown rapid progress in the past few years. Different from traditional heavy metals, TIs exhibit very strong SOC and nontrivial topological surface states that originate in the bulk band topology order, which can provide very efficient means to manipulate adjacent magnetic materials when passing a charge current through them. In this paper, we review the recent progress in the TI-based magnetic spintronics research field. In particular, we focus on the spin–orbit torque (SOT)-induced magnetization switching in the magnetic TI structures, spin–torque ferromagnetic resonance (ST-FMR) measurements in the TI/ferromagnet structures, spin pumping and spin injection effects in the TI/magnet structures, as well as the electrical detection of the surface spin-polarized current in TIs. Finally, we discuss the challenges and opportunities in the TI-based spintronics field and its potential applications in ultralow power dissipation spintronic memory and logic devices.

Spin-orbit splittings and energy band gaps calculated with the Heyd-Scuseria-Ernzerhof screened hybrid functional

2006 ◽  
Vol 74 (7) ◽  
Author(s):  
Juan E. Peralta ◽  
Jochen Heyd ◽  
Gustavo E. Scuseria ◽  
Richard L. Martin
Keyword(s):  
Energy Band ◽  
Band Gaps ◽  
Spin Orbit ◽  
Hybrid Functional
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