期刊
NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41467-021-23076-1
关键词
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资金
- National Key R&D program of China [2017YFA0305400]
- Oxford-ShanghaiTech collaboration project
- Shanghai Municipal Science and Technology Major Project [2018SHZDZX02]
- Shanghai Technology Innovation Action Plan 2020-Integrated Circuit Technology Support Program [20DZ1100605]
- Natural Science Foundation of China [11774190, 11634009, 12074181, 11834006, 21871008]
- Fundamental Research Funds for the Central Universities [020414380149]
- Natural Science Foundation of Jiangsu Province [BK20200007]
- Fok Ying-Tong Education Foundation of China [161006]
- International Postdoctoral Exchange Fellowship Program (Talent-Introduction Program) [YJ20200126]
- National Natural Science Foundation of China [12004361]
- China Scholarship Council
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
Topological superconductors, crucial for future quantum computation, are rare in nature. However, the study reveals topological surface states in 2M-WS2 acquiring a nodeless superconducting gap similar to that of the bulk states, suggesting an intrinsic topological superconductor.
Topological superconductors (TSCs) are unconventional superconductors with bulk superconducting gap and in-gap Majorana states on the boundary that may be used as topological qubits for quantum computation. Despite their importance in both fundamental research and applications, natural TSCs are very rare. Here, combining state of the art synchrotron and laser-based angle-resolved photoemission spectroscopy, we investigated a stoichiometric transition metal dichalcogenide (TMD), 2M-WS2 with a superconducting transition temperature of 8.8K (the highest among all TMDs in the natural form up to date) and observed distinctive topological surface states (TSSs). Furthermore, in the superconducting state, we found that the TSSs acquired a nodeless superconducting gap with similar magnitude as that of the bulk states. These discoveries not only evidence 2M-WS2 as an intrinsic TSC without the need of sensitive composition tuning or sophisticated heterostructures fabrication, but also provide an ideal platform for device applications thanks to its van der Waals layered structure. Topological superconductors are potentially important for future quantum computation, but they are very rare in nature. Here, the authors observe topological surface states acquiring a nodeless superconducting gap with similar magnitude as that of the bulk states in 2M-WS2, suggesting an intrinsic topological superconductor.
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