One-Dimensional Edge Transport in Few-Layer WTe2

Kononov, Artem; Abulizi, Gulibusitan; Qu, Kejian; Yan, Jiaqiang; Mandrus, David; Wantanabe, Kenji; Taniguchi, Takashi; Schonenberger, Christian

doi:10.1021/acs.nanolett.0c00658

One-Dimensional Edge Transport in Few-Layer WTe₂

Journal Article · Tue May 12 00:00:00 EDT 2020 · Nano Letters (Online)

DOI:https://doi.org/10.1021/acs.nanolett.0c00658· OSTI ID:1657932

^[1]; Abulizi, Gulibusitan ^[2]; Qu, Kejian ^[3]; ^[4]; Mandrus, David ^[4]; ^[5]; ^[5]; ^[6]

Univ. of Basel (Switzerland); Russian Academy of Sciences (RAS), Moscow (Russian Federation)
Univ. of Basel (Switzerland)
Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
National Inst. for Materials Science (NIMS), Tsukuba (Japan)
Univ. of Basel (Switzerland); National Inst. for Materials Science (NIMS), Tsukuba (Japan)

WTe₂ is a layered transitional-metal dichalcogenide (TMD) with a number of intriguing topological properties. Recently, WTe₂ has been predicted to be a higher-order topological insulator (HOTI) with topologically protected hinge states along the edges. The gapless nature of WTe₂ complicates the observation of one-dimensional (1D) topological states in transport due to their small contribution relative to the bulk. Here, we study the behavior of the Josephson effect in magnetic field to distinguish edge from bulk transport. The Josephson effect in few-layer WTe₂ reveals 1D states residing on the edges and steps. Moreover, our data demonstrates a combination of Josephson transport properties observed solely in another HOTI—bismuth, including Josephson transport over micrometer distances, extreme robustness in a magnetic field, and nonsinusoidal current-phase relation (CPR). Our observations strongly suggest the topological origin of the 1D states and that few-layer WTe₂ is a HOTI.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: European Research Council (ERC); Ministry of Education, Culture, Sports, Science and Technology (MEXT); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1657932

Journal Information:: Nano Letters (Online), Journal Name: Nano Letters (Online) Journal Issue: 6 Vol. 20; ISSN 1530-6992

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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