期刊
NANO LETTERS
卷 20, 期 6, 页码 4228-4233出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00658
关键词
WTe2; 1D edge states; Josephson effect; nonsinusoidal CPR; higher order topological insulators
类别
资金
- Georg H. Endress foundation
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [787414 TopSupra]
- Swiss National Science Foundation through the National Centre of Competence in Research Quantum Science and Technology (QSIT)
- Swiss Nanoscience Institute (SNI)
- Elemental Strategy Initiative
- CREST [JPMJCR15F3]
- U.S. Department of Energy (U.S. DOE), Office of Science, Basic Energy Sciences (BES), Materials Sciences and Engineering Division
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.
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