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Kim, Bumjoon
원자제어 저차원 전자계 연구단
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Evidence of higher-order topology in multilayer WTe2 from Josephson coupling through anisotropic hinge states

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Title
Evidence of higher-order topology in multilayer WTe2 from Josephson coupling through anisotropic hinge states
Author(s)
Yong-Bin Choi; Yingming Xie; Chui-Zhen Chen; Jinho Park; Su-Beom Song; Jiho Yoon; Bum Joon Kim; Takashi Taniguchi; Kenji Watanabe; Jonghwan Kim; Kin Chung Fong; Mazhar N. Ali; Kam Tuen Law; Gil-Ho Lee
Publication Date
2020-09
Journal
NATURE MATERIALS, v.19, no.9, pp.974 - 979
Publisher
NATURE PUBLISHING GROUP
Abstract
© 2020, The Author(s), under exclusive licence to Springer Nature Limited. 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 the a axis of the WTe2 crystal, but not along the b axis, 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 WTe2 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
URI
https://pr.ibs.re.kr/handle/8788114/7662
DOI
10.1038/s41563-020-0721-9
ISSN
1476-1122
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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