2016年2月2日
Superconductivity protected by spin-valley locking in ion-gated MoS2
Nature Physics
- 巻
- 12
- 号
- 2
- 開始ページ
- 144
- 終了ページ
- 149
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1038/nphys3580
© 2016 Macmillan Publishers Limited. Symmetry-breaking has been known to play a key role in non-centrosymmetric superconductors with strong spin-orbit interactions (SOIs; refs,). The studies, however, have been so far mainly focused on a particular type of SOI, known as the Rashba SOI (ref.), whereby the electron spin is locked to its momentum at a right-angle, thereby leading to an in-plane helical spin texture. Here we discuss electric-field-induced superconductivity in molybdenum disulphide (MoS 2), which exhibits a fundamentally different type of intrinsic SOI, manifested by an out-of-plane Zeeman-type spin polarization of energy valleys. We find an upper critical field of approximately 52 T at 1.5 K, which indicates an enhancement of the Pauli limit by a factor of four as compared to that in centrosymmetric conventional superconductors. Using realistic tight-binding calculations, we reveal that this unusual behaviour is due to an inter-valley pairing that is symmetrically protected by Zeeman-type spin-valley locking against external magnetic fields. Our study sheds light on the interplay of inversion asymmetry with SOIs in confined geometries, and its role in superconductivity.
- リンク情報
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- DOI
- https://doi.org/10.1038/nphys3580
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000369319500014&DestApp=WOS_CPL
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84956644846&origin=inward
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84956644846&origin=inward
- ID情報
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- DOI : 10.1038/nphys3580
- ISSN : 1745-2473
- eISSN : 1745-2481
- SCOPUS ID : 84956644846
- Web of Science ID : WOS:000369319500014