Journal
NATIONAL SCIENCE REVIEW
Volume 7, Issue 9, Pages 1468-1475Publisher
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwaa114
Keywords
WTe2; Josephson junction; Weyl semimetal; edge superconductivity; non-symmetric effect
Categories
Funding
- National Key Research and Development Program of China [2017YFA0303302, 2018YFA0305601]
- Science and Technology Commission of Shanghai [19511120500]
- National Natural Science Foundation of China [61322407, 11934005, 11874116, 61674040]
- Indian Institute of Science
- China Postdoctoral Innovative Talents Support Program
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WTe2, as a type-II Weyl semimetal, has 2D Fermi arcs on the (001) surface in the bulk and 1D helical edge states in its monolayer. These features have recently attracted wide attention in condensed matter physics. However, in the intermediate regime between the bulk and monolayer, the edge states have not been resolved owing to its closed band gap which makes the bulk states dominant. Here, we report the signatures of the edge superconductivity by superconducting quantum interference measurements in multilayer WTe2 Josephson junctions and we directly map the localized supercurrent. In thick WTe2 (similar to 60 nm), the supercurrent is uniformly distributed by bulk states with symmetric Josephson effect (vertical bar I-c(+) (B)vertical bar=vertical bar I-c(-) (B)vertical bar). In thin WTe2 (10 nm), however, the supercurrent becomes confined to the edge and its width reaches up to 1.4 mu m and exhibits non-symmetric behavior vertical bar I-c(+) (B)vertical bar not equal vertical bar I-c(-) (B)vertical bar. The ability to tune the edge domination by changing thickness and the edge superconductivity establishes WTe2 as a promising topological system with exotic quantum phases and a rich physics.
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