Possible Topological Superconducting Phases of MoS${}_2$

Abstract

Molybdenum disulphide (MoS${}_2$) has attracted much interest in recent years due to its potential applications in a new generation of electronic devices. Recently, it was shown that thin films of MoS${}_2$ can become superconducting with a highest $T_c$ of 10K when the material is heavily gated to the conducting regime. In this work, using the group theoretical approach, we determine the possible pairing symmetries of heavily gated MoS${}_2$. Depending on the electron-electron interactions, the material can support an exotic spin-singlet $p+ip$-wave-like, an exotic spin-triplet s-wave-like and an conventional spin-triplet $p$-wave pairing phases. Importantly, the exotic spin-singlet $p+ip$-wave phase is a topological superconducting phase which breaks time-reversal symmetry spontaneously and possesses chiral Majorana edge states.

5 pages, 4 figures. References added. Comments are welcome

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