Superlinear Photogalvanic Effects in ( Bi0.3Sb0.7)2 ( Te0.1Se0.9)3 : Probing Three-Dimensional Topological Insulator Surface States at Room Temperature

2021 ◽  
Vol 16 (6) ◽  
Author(s):  
S. N. Danilov ◽  
L. E. Golub ◽  
T. Mayer ◽  
A. Beer ◽  
S. Binder ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Room Temperature ◽  
Three Dimensional ◽  
Surface States ◽  
Insulator Surface

scholarly journals GROWTH OF QUANTUM WELL FILMS OF TOPOLOGICAL INSULATOR Bi2Se3 ON INSULATING SUBSTRATE

SPIN ◽  
2011 ◽  
Vol 01 (01) ◽  
pp. 21-25 ◽  
Author(s):  
CUI-ZU CHANG ◽  
KE HE ◽  
LI-LI WANG ◽  
XU-CUN MA ◽  
MIN-HAO LIU ◽  
...  
Keyword(s):  
Quantum Well ◽  
Topological Insulator ◽  
Electrical Transport ◽  
Room Temperature ◽  
Molecular Beam ◽  
Three Dimensional ◽  
Surface States ◽  
Temperature Application ◽  
Low Dimensional ◽  
Quantum Well States

Insulating substrates are crucial for electrical transport study and room-temperature application of topological insulator films at thickness of only several nanometers. High-quality quantum well films of Bi 2 Se 3, a typical three-dimensional topological insulator, have been grown on α- Al 2 O 3 (sapphire) (0001) by molecular beam epitaxy. The films exhibit well-defined quantum well states and surface states, suggesting the uniform thickness over macroscopic area. The Bi 2 Se 3 thin films on sapphire (0001) provide a good system to study low-dimensional physics of topological insulators since conduction contribution from the substrate is negligibly small.

scholarly journals Exceptional topological insulators

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
M. Michael Denner ◽  
Anastasiia Skurativska ◽  
Frank Schindler ◽  
Mark H. Fischer ◽  
Ronny Thomale ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Three Dimensional ◽  
Surface States ◽  
Exceptional Point ◽  
Weyl Semimetal ◽  
Complex Eigenvalues ◽  
Topological State ◽  
Single Sheet ◽  
Bulk Energy ◽  
State Of Matter

AbstractWe introduce the exceptional topological insulator (ETI), a non-Hermitian topological state of matter that features exotic non-Hermitian surface states which can only exist within the three-dimensional topological bulk embedding. We show how this phase can evolve from a Weyl semimetal or Hermitian three-dimensional topological insulator close to criticality when quasiparticles acquire a finite lifetime. The ETI does not require any symmetry to be stabilized. It is characterized by a bulk energy point gap, and exhibits robust surface states that cover the bulk gap as a single sheet of complex eigenvalues or with a single exceptional point. The ETI can be induced universally in gapless solid-state systems, thereby setting a paradigm for non-Hermitian topological matter.

Topological phases of a three-dimensional topological insulator with structure inversion asymmetry

2015 ◽  
Vol 29 (06) ◽  
pp. 1550034 ◽  
Author(s):  
Xiaoyong Guo ◽  
Zaijun Wang ◽  
Qiang Zheng ◽  
Jie Peng
Keyword(s):  
Phase Diagram ◽  
Topological Insulator ◽  
Tight Binding ◽  
Three Dimensional ◽  
Surface States ◽  
Topological Phases ◽  
Zeeman Field ◽  
Surface Modes ◽  
Inversion Asymmetry ◽  
Structure Inversion

We investigate the topological phases of a three-dimensional (3D) topological insulator (TI) without the top–bottom inversion symmetry. We calculate the momentum depended spin Chern number to extract the phase diagram. Various phases are found and we address the dependence of phase boundaries on the strength of inversion asymmetry. Opposite to the quasi-two-dimensional thin film TI, in our 3D system the TI state is stabilized by the structure inversion asymmetry (SIA). With a strong SIA the 3D TI phase can exist even under a large Zeeman field. In a tight-binding form, the surface modes are discussed to confirm with the phase diagram. Particularly we find that the SIA cannot destroy the surface states but open a gap on its spectrum.

The effect of electric potential on Landau levels for topological insulator surface states

2014 ◽  
Vol 445 ◽  
pp. 81-87 ◽  
Author(s):  
Yiman Liu ◽  
Xiaoying Zhou ◽  
Huaihua Shao ◽  
Ma Zhou ◽  
Guanghui Zhou
Keyword(s):  
Topological Insulator ◽  
Electric Potential ◽  
Surface States ◽  
Landau Levels ◽  
Insulator Surface

scholarly journals Spin-patterned plasmonics: towards optical access to topological-insulator surface states

2015 ◽  
Vol 23 (25) ◽  
pp. 32759 ◽  
Author(s):  
Grisha Spektor ◽  
Asaf David ◽  
Guy Bartal ◽  
Meir Orenstein ◽  
Alex Hayat
Keyword(s):  
Topological Insulator ◽  
Surface States ◽  
Optical Access ◽  
Insulator Surface
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