Details

Autor(en) / Beteiligte

• Li, Y. W.
• Zheng, H. J.
• Fang, Y. Q.
• Zhang, D. Q.
• Chen, Y. J.
• Chen, C.
• Liang, A. J.
• Shi, W. J.
• Pei, D.
• Xu, L. X.
• Liu, S.
• Pan, J.
• Lu, D. H.
• Hashimoto, M.
• Barinov, A.
• Jung, S. W.
• Cacho, C.
• Wang, M. X.
• He, Y.
• Fu, L.
• Zhang, H. J.
• Huang, F. Q.
• Yang, L. X.
• Liu, Z. K.
• Chen, Y. L.

Titel

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

Ist Teil von

• Nature communications, 2021-05, Vol.12 (1), p.2874-2874, Article 2874

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• 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-WS 2 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-WS 2 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.