Open Access System for Information Sharing

Login Library

 

Article
Cited 2 time in webofscience Cited 1 time in scopus
Metadata Downloads

Evidence of higher-order topology in multilayer WTe(2)from Josephson coupling through anisotropic hinge states

Title
Evidence of higher-order topology in multilayer WTe(2)from Josephson coupling through anisotropic hinge states
Authors
Choi, Y.-B.Xie, Y.Chen, C.-Z.Park, J.Song, S.-B.Yoon, J.KIM, BUMJOONTaniguchi, T.Watanabe, K.Kim, J.Fong, K.C.Ali, M.N.Law, K.T.Lee, G.-H.
Date Issued
Sep-2020
Publisher
NATURE PUBLISHING GROUP
Abstract
Td-WTe2(non-centrosymmetric and orthorhombic), a type-II Weyl semimetal, is expected to have higher-order topological phases with topologically protected, helical one-dimensional hinge states when its Weyl points are annihilated. However, the detection of these hinge states is difficult due to the semimetallic behaviour of the bulk. In this study, we have spatially resolved the hinge states by analysing the magnetic field interference of the supercurrent in Nb-WTe2-Nb proximity Josephson junctions. The Josephson current along theaaxis of the WTe(2)crystal, but not along thebaxis, showed a sharp enhancement at the edges of the junction, and the amount of enhanced Josephson current was comparable to the upper limits of a single one-dimensional helical channel. Our experimental observations suggest a higher-order topological phase in WTe(2)and its corresponding anisotropic topological hinge states, in agreement with theoretical calculations. Our work paves the way for the study of hinge states in topological transition-metal dichalcogenides and analogous phases. Transport measurements and calculations show that WTe(2)may be a higher-order topological insulator with topological hinge states.
URI
http://oasis.postech.ac.kr/handle/2014.oak/104523
ISSN
1476-1122
Article Type
Article
Citation
NATURE MATERIALS, vol. 19, page. 974 - 979, 2020-09
Files in This Item:
There are no files associated with this item.

qr_code

  • mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher

김종환KIM, JONGHWAN
Dept of Materials Science & Enginrg
Read more

Views & Downloads

Browse