Theory of glide symmetry protected helical edge states in a WTe2 monolayer

Bieniek, Maciej; Väyrynen, Jukka I.; Li, Gang; Neupert, Titus; Thomale, Ronny

doi:10.1103/physrevb.107.195105

Theory of glide symmetry protected helical edge states in a WTe₂ monolayer

Journal Article · Wed May 03 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.107.195105· OSTI ID:2424080

^[1]; ^[2]; Li, Gang ^[3]; ^[4]; ^[5]

Univ. of Wurzburg (Germany); Wroclaw Univ. of Science and Technology (Poland); Univ. of Ottawa, ON (Canada)
Purdue Univ., West Lafayette, IN (United States)
ShanghaiTech Univ. (China)
Univ. of Zurich (Switzerland)
Univ. of Wurzburg (Germany)

Helical edge states in quantum spin Hall (QSH) materials are central building blocks of topological matter design and engineering. Despite their principal topological protection against elastic backscattering, the level of operational stability depends on manifold parameters such as the band gap of the given semiconductor system in the “inverted” regime, temperature, disorder, and crystal orientation. Here, we theoretically investigate electronic and transport properties of QSH edge states in large gap 1-T' WTe₂ monolayers. We explore the impact of edge termination, disorder, temperature, and interactions on experimentally addressable edge state observables, such as local density of states and conductance. We show that conductance quantization can remain surprisingly robust even for heavily disordered samples because of an anomalously small edge state decay length and additional protection related to the large direct gap allowed by glide symmetry. From the simulation of temperature-dependent resistance, we find that moderate disorder enhances the stability of conductance by localizing bulk states. We evaluate the edge state velocity and Luttinger liquid parameter as functions of the chemical potential, finding prospects for physics beyond linear helical Luttinger liquids in samples with ultraclean and well-defined edges.

View Accepted Manuscript (DOE)

Research Organization:: National Quantum Information Science (QIS) Research Centers (United States). The Quantum Science Center (QSC)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2424080

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 19 Vol. 107; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Theory of glide symmetry protected helical edge states in a WTe2 monolayer

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Theory of glide symmetry protected helical edge states in a WTe₂ monolayer