Quantum Spin Hall Edge States and Interlayer Coupling in Twisted Bilayer WTe2

Lüpke, Felix; Waters, Dacen; Pham, Anh D.; Yan, Jiaqiang; Mandrus, David G.; Ganesh, Panchapakesan; Hunt, Benjamin M.

doi:10.1021/acs.nanolett.2c00432

Quantum Spin Hall Edge States and Interlayer Coupling in Twisted Bilayer WTe₂

Journal Article · Mon Jun 27 00:00:00 EDT 2022 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.2c00432· OSTI ID:1884030

^[1]; ^[2]; ^[3]; ^[3]; ^[4]; ^[3]; Hunt, Benjamin M. ^[5]

Carnegie Mellon Univ., Pittsburgh, PA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States); Peter Grünberg Instit. (Germany)
Carnegie Mellon Univ., Pittsburgh, PA (United States); Univ. of Washington, Seattle, WA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Carnegie Mellon Univ., Pittsburgh, PA (United States)

The quantum spin Hall (QSH) effect, characterized by topologically protected spin-polarized edge states, was recently demonstrated in monolayers of the transition metal dichalcogenide (TMD) WTe₂. However, the robustness of this topological protection remains largely unexplored in van der Waals heterostructures containing one or more layers of a QSH insulator. Here, we use scanning tunneling microscopy and spectroscopy (STM/STS) to explore the topological nature of twisted bilayer (tBL) WTe₂. Furthermore, at the tBL edges, we observe the characteristic spectroscopic signatures of the QSH edge states. For small twist angles, a rectangular moiré pattern develops, which results in local modifications of the band structure. Using first-principles calculations, we quantify the interactions in tBL WTe₂ and its topological edge states as a function of interlayer distance and conclude that it is possible to engineer the topology of WTe₂ bilayers via the twist angle as well as interlayer interactions.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); German Research Foundation (DFG)

Grant/Contract Number:: AC05-00OR22725; SC0018115

OSTI ID:: 1884030

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 14 Vol. 22; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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