Tuning magnetism and topology in topological insulators with broken time reversal symmetry

2018 ◽  
pp. 251-251
Author(s):  
Yayu Wang
Keyword(s):  
Time Reversal ◽  
Topological Insulators ◽  
Time Reversal Symmetry ◽  
And Topology

scholarly journals Phase diagrams of superconducting topological surface states

2021 ◽  
Vol 24 (4) ◽  
pp. 43701
Author(s):  
W. Zhao ◽  
L. Ding ◽  
B. Zhou ◽  
J. Wu ◽  
Y. Bai ◽  
...  
Keyword(s):  
Phase Diagrams ◽  
Time Reversal ◽  
Mirror Symmetry ◽  
Surface States ◽  
Time Reversal Symmetry ◽  
And Topology ◽  
Topological Surface ◽  
Iron Based ◽  
Crystalline Symmetry

In this paper, we present a detailed study on the phase diagrams of superconducting topological surface states, especially, focusing on the interplay between crystalline symmetry and topology of the effective BdG Hamiltonian. We show that for the 4 x 4 kinematic Hamiltonian of the normal state, a mirror symmetry M can be defined, and for the M-odd pairings, the classification of the 8 x 8 BdG Hamiltonian is ℤ⊕ℤ, and the time-reversal symmetry is broken intrinsically. The topological non-trivial phase can support chiral Majorana edge modes, and can be realized in the thin films of iron-based superconductor such as FeSeTe.

scholarly journals Breaking time reversal symmetry in topological insulators

MRS Bulletin ◽  
2014 ◽  
Vol 39 (10) ◽  
pp. 867-872 ◽  
Author(s):  
Cui-Zu Chang ◽  
Peng Wei ◽  
Jagadeesh S. Moodera
Keyword(s):  
Time Reversal ◽  
Topological Insulators ◽  
Time Reversal Symmetry ◽  
Breaking Time ◽  
Image Position

Abstract

scholarly journals Topological crystalline insulator nanostructures

Nanoscale ◽  
2014 ◽  
Vol 6 (23) ◽  
pp. 14133-14140 ◽  
Author(s):  
Jie Shen ◽  
Judy J. Cha
Keyword(s):  
Time Reversal ◽  
Topological Insulators ◽  
Surface States ◽  
Time Reversal Symmetry ◽  
Topological Crystalline Insulators ◽  
Topological Crystalline Insulator ◽  
Crystalline Symmetry

Topological crystalline insulators are topological insulators whose surface states are protected by the crystalline symmetry, instead of the time reversal symmetry.

scholarly journals Visualization of superparamagnetic dynamics in magnetic topological insulators

2015 ◽  
Vol 1 (10) ◽  
pp. e1500740 ◽  
Author(s):  
Ella O. Lachman ◽  
Andrea F. Young ◽  
Anthony Richardella ◽  
Jo Cuppens ◽  
H. R. Naren ◽  
...  
Keyword(s):  
Phase Transition ◽  
Time Reversal ◽  
Quantum Interference ◽  
Topological Insulators ◽  
Quantum Phase Transitions ◽  
Electronic System ◽  
Characteristic Size ◽  
Quantum Phase ◽  
Time Reversal Symmetry ◽  
Hall Conductance

Quantized Hall conductance is a generic feature of two-dimensional electronic systems with broken time reversal symmetry. In the quantum anomalous Hall state recently discovered in magnetic topological insulators, time reversal symmetry is believed to be broken by long-range ferromagnetic order, with quantized resistance observed even at zero external magnetic field. We use scanning nanoSQUID (nano–superconducting quantum interference device) magnetic imaging to provide a direct visualization of the dynamics of the quantum phase transition between the two anomalous Hall plateaus in a Cr-doped (Bi,Sb)2Te3 thin film. Contrary to naive expectations based on macroscopic magnetometry, our measurements reveal a superparamagnetic state formed by weakly interacting magnetic domains with a characteristic size of a few tens of nanometers. The magnetic phase transition occurs through random reversals of these local moments, which drive the electronic Hall plateau transition. Surprisingly, we find that the electronic system can, in turn, drive the dynamics of the magnetic system, revealing a subtle interplay between the two coupled quantum phase transitions.

scholarly journals Spin-Orbit-Free Topological Insulators without Time-Reversal Symmetry

2014 ◽  
Vol 113 (11) ◽  
Author(s):  
A. Alexandradinata ◽  
Chen Fang ◽  
Matthew J. Gilbert ◽  
B. Andrei Bernevig
Keyword(s):  
Time Reversal ◽  
Topological Insulators ◽  
Time Reversal Symmetry ◽  
Spin Orbit
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