Superconductivity protected by spin-valley locking in ion-gated MoS2

Abstract

Symmetry-breaking has been known to play a key role in noncentrosymmetric superconductors with strong spin-orbit-interaction (SOI). The studies, however, have been so far mainly focused on a particular type of SOI, known as Rashba SOI, whereby the electron spin is locked to its momentum at a right-angle, thereby leading to an in-planar helical spin texture. Here we discuss electric-field-induced superconductivity in molybdenum disulphide (MoS2), 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 a new light on the interplay of inversion asymmetry with SOI in confined geometries, and its unprecedented role in superconductivity.

37 pages, 11 figures, http://meetings.aps.org/Meeting/MAR15/Session/G11.11

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• The Valley Hall Effect in MoS2 Transistors
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• Phase Diagram of Electron Doped Dichalcogenides
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• Colossal enhancement of upper critical fields in noncentrosymmetric heavy fermion superconductors near quantum criticality: CeRhSi${}_3$ and CeIrSi${}_3$
• Magnetic Properties in Non-centrosymmetric Superconductors with and without Antiferromagnetic Order
• FFLO Superconductivity near the Antiferromagnetic Quantum Critical Point
• Multi-terminal electrical transport measurements of molybdenum disulphide using van der Waals heterostructure device platform

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