Observation of topological superconductivity in a stoichiometric transition metal dichalcogenide 2M-WS2

Y. W. Li, H. J. Zheng, Y. Q. Fang, D. Q. Zhang, Y. J. Chen, C. Chen, A. J. Liang, W. J. Shi, D. Pei, L. X. Xu, S. Liu, J. Pan, D. H. Lu, M. Hashimoto, A. Barinov, S. W. Jung, C. Cacho, M. X. Wang, Y. He, L. Fu, H. J. Zhang (), F. Q. Huang (), L. X. Yang (), Z. K. Liu () and Y. L. Chen ()
Additional contact information
Y. W. Li: School of Physical Science and Technology, ShanghaiTech University
H. J. Zheng: School of Physical Science and Technology, ShanghaiTech University
Y. Q. Fang: State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Science
D. Q. Zhang: China Jiliang University
Y. J. Chen: Tsinghua University
C. Chen: School of Physical Science and Technology, ShanghaiTech University
A. J. Liang: School of Physical Science and Technology, ShanghaiTech University
W. J. Shi: ShanghaiTech University
D. Pei: University of Oxford
L. X. Xu: School of Physical Science and Technology, ShanghaiTech University
S. Liu: School of Physical Science and Technology, ShanghaiTech University
J. Pan: State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Science
D. H. Lu: SLAC National Accelerator Laboratory
M. Hashimoto: SLAC National Accelerator Laboratory
A. Barinov: Elettra-Sincrotrone Trieste, Trieste
S. W. Jung: Diamond Light Source, Harwell Campus
C. Cacho: Diamond Light Source, Harwell Campus
M. X. Wang: School of Physical Science and Technology, ShanghaiTech University
Y. He: University of California at Berkeley
L. Fu: Massachusetts Institute of Technology
H. J. Zhang: National Laboratory of Solid State Microstructures and School of Physics Nanjing University
F. Q. Huang: State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Science
L. X. Yang: Tsinghua University
Z. K. Liu: School of Physical Science and Technology, ShanghaiTech University
Y. L. Chen: School of Physical Science and Technology, ShanghaiTech University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract 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 8.8 K (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.

Date: 2021
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DOI: 10.1038/s41467-021-23076-1

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