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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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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cited_by cdi_FETCH-LOGICAL-c343t-9878d7231dfbdc4992682d01c9ff66ae9388a9d6906487ac6df90ff2ab04ef943
cites cdi_FETCH-LOGICAL-c343t-9878d7231dfbdc4992682d01c9ff66ae9388a9d6906487ac6df90ff2ab04ef943
container_end_page 116402
container_issue 11
container_start_page 1
container_title Physical review letters
container_volume 127
creator Zhou, Tong
Cheng, Shuguang
Schleenvoigt, Michael
Schüffelgen, Peter
Jiang, Hua
Yang, Zhongqin
Žutić, Igor
description 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.
doi_str_mv 10.1103/PhysRevLett.127.116402
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source American Physical Society:Jisc Collections:APS Read and Publish 2023-2025 (reading list)
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
title Quantum Spin-Valley Hall Kink States: From Concept to Materials Design
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