scholarly journals Mirror-symmetry protected non-TRIM surface state in the weak topological insulator Bi2TeI

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
I. P. Rusinov ◽  
T. V. Menshchikova ◽  
A. Isaeva ◽  
S. V. Eremeev ◽  
Yu. M. Koroteev ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Surface State ◽  
Mirror Symmetry ◽  
Symmetry Protected

scholarly journals Enhanced surface state protection and band gap in the topological insulator PbBi4Te4S3

2018 ◽  
Vol 2 (10) ◽  
Author(s):  
K. Sumida ◽  
T. Natsumeda ◽  
K. Miyamoto ◽  
I. V. Silkin ◽  
K. Kuroda ◽  
...  
Keyword(s):  
Band Gap ◽  
Topological Insulator ◽  
Surface State ◽  
Enhanced Surface ◽  
State Protection

Inversion/Mirror Symmetry-Protected Dirac Cones in Distorted Ruby Lattices

2020 ◽  
Vol 37 (12) ◽  
pp. 127102
Author(s):  
Lei Sun ◽  
Xiaoming Zhang ◽  
Han Gao ◽  
Jian Liu ◽  
Feng Liu ◽  
...  
Keyword(s):  
Mirror Symmetry ◽  
Symmetry Protected

scholarly journals Termination switching of antiferromagnetic proximity effect in topological insulator

2020 ◽  
Vol 6 (33) ◽  
pp. eaaz8463
Author(s):  
Chao-Yao Yang ◽  
Lei Pan ◽  
Alexander J. Grutter ◽  
Haiying Wang ◽  
Xiaoyu Che ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Topological Insulator ◽  
Surface State ◽  
Proximity Effect ◽  
Surface States ◽  
Double Exchange ◽  
Exchange Interactions ◽  
Stacking Order ◽  
Bst Films ◽  
Magnetic Proximity Effect

This work reports the ferromagnetism of topological insulator, (Bi,Sb)2Te3 (BST), with a Curie temperature of approximately 120 K induced by magnetic proximity effect (MPE) of an antiferromagnetic CrSe. The MPE was shown to be highly dependent on the stacking order of the heterostructure, as well as the interface symmetry: Growing CrSe on top of BST results in induced ferromagnetism, while growing BST on CrSe yielded no evidence of an MPE. Cr-termination in the former case leads to double-exchange interactions between Cr3+ surface states and Cr2+ bulk states. This Cr3+-Cr2+ exchange stabilizes the ferromagnetic order localized at the interface and magnetically polarizes the BST Sb band. In contrast, Se-termination at the CrSe/BST interface yields no detectable MPE. These results directly confirm the MPE in BST films and provide critical insights into the sensitivity of the surface state.

Surface state dominated transport in topological insulator Bi2Te3 nanowires

2013 ◽  
Vol 103 (19) ◽  
pp. 193107 ◽  
Author(s):  
Bacel Hamdou ◽  
Johannes Gooth ◽  
August Dorn ◽  
Eckhard Pippel ◽  
Kornelius Nielsch
Keyword(s):  
Topological Insulator ◽  
Surface State

scholarly journals Photonic topological insulator with broken time-reversal symmetry

2016 ◽  
Vol 113 (18) ◽  
pp. 4924-4928 ◽  
Author(s):  
Cheng He ◽  
Xiao-Chen Sun ◽  
Xiao-Ping Liu ◽  
Ming-Hui Lu ◽  
Yulin Chen ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Time Reversal ◽  
Magnetoelectric Coupling ◽  
Electronic Systems ◽  
Time Reversal Symmetry ◽  
Edge States ◽  
Protection Mechanism ◽  
Fundamental Particles ◽  
Left And Right ◽  
Symmetry Protected

A topological insulator is a material with an insulating interior but time-reversal symmetry-protected conducting edge states. Since its prediction and discovery almost a decade ago, such a symmetry-protected topological phase has been explored beyond electronic systems in the realm of photonics. Electrons are spin-1/2 particles, whereas photons are spin-1 particles. The distinct spin difference between these two kinds of particles means that their corresponding symmetry is fundamentally different. It is well understood that an electronic topological insulator is protected by the electron’s spin-1/2 (fermionic) time-reversal symmetry Tf2=−1. However, the same protection does not exist under normal circumstances for a photonic topological insulator, due to photon’s spin-1 (bosonic) time-reversal symmetry Tb2=1. In this work, we report a design of photonic topological insulator using the Tellegen magnetoelectric coupling as the photonic pseudospin orbit interaction for left and right circularly polarized helical spin states. The Tellegen magnetoelectric coupling breaks bosonic time-reversal symmetry but instead gives rise to a conserved artificial fermionic-like-pseudo time-reversal symmetry, Tp (Tp2=−1), due to the electromagnetic duality. Surprisingly, we find that, in this system, the helical edge states are, in fact, protected by this fermionic-like pseudo time-reversal symmetry Tp rather than by the bosonic time-reversal symmetry Tb. This remarkable finding is expected to pave a new path to understanding the symmetry protection mechanism for topological phases of other fundamental particles and to searching for novel implementations for topological insulators.

scholarly journals Positron surface state as a spectroscopic probe for characterizing surfaces of topological insulator materials

2016 ◽  
Vol 94 (11) ◽  
Author(s):  
Vincent Callewaert ◽  
K. Shastry ◽  
Rolando Saniz ◽  
Ilja Makkonen ◽  
Bernardo Barbiellini ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Surface State ◽  
Spectroscopic Probe
Sign in / Sign up

Export Citation Format

Share Document