Quantum Spin-Valley Hall Kink States: From Concept to Materials Design

We propose a general and tunable platform to realize high-density arrays of quantum spin-valley Hall kink (QSVHK) states with spin-valley-momentum locking based on a two-dimensional hexagonal topological insulator. Through the analysis of Berry curvature and topological charge, the QSVHK states are...

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Bibliographic Details
Published in:Physical review letters 2021-09, Vol.127 (11), p.1-116402, Article 116402
Main Authors: Zhou, Tong, Cheng, Shuguang, Schleenvoigt, Michael, Schüffelgen, Peter, Jiang, Hua, Yang, Zhongqin, Žutić, Igor
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Electric fields
Electric filters
Electromagnetic wave filters
First principles
Locking
Room temperature
Topological insulators
Two dimensional analysis
Valleys
Waveguides
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Summary:We propose a general and tunable platform to realize high-density arrays of quantum spin-valley Hall kink (QSVHK) states with spin-valley-momentum locking based on a two-dimensional hexagonal topological insulator. Through the analysis of Berry curvature and topological charge, the QSVHK states are found to be topologically protected by the valley-inversion and time-reversal symmetries. Remarkably, the conductance of QSVHK states remains quantized against both nonmagnetic short- and long-range and magnetic long-range disorder, verified by the Green-function calculations. Based on first-principles results and our fabricated samples, we show that QSVHK states, protected with a gap up to 287 meV, can be realized in bismuthene by alloy engineering, surface functionalization, or electric field, supporting nonvolatile applications of spin-valley filters, valves, and waveguides even at room temperature.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.127.116402