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

References in corpus (6)

• Valley polarization in MoS2 monolayers by optical pumping
• Classification of topological insulators and superconductors in three spatial dimensions
• Quasiparticle band structures and optical properties of strained monolayer MoS2 and WS2
• Topological Defects and Gapless Modes in Insulators and Superconductors
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Cited by in corpus (17)

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• First-principles theory of field-effect doping in transition-metal dichalcogenides: Structural properties, electronic structure, Hall coefficient, and electrical conductivity
• Visualization of Topological Boundary Modes Manifesting Topological Nodal-Point Superconductivity
• Unconventional superconductivity in bilayer transition metal dichalcogenides
• Enhancement of the upper critical field in disordered transition metal dichalcogenide monolayers
• Odd-parity superconductivity in bilayer transition metal dichalcogenides
• Band filling and cross quantum capacitance in ion gated semiconducting transition metal dichalcogenide monolayers
• Observation of multiple types of topological fermions in PdBiSe
• Gated Tuned Superconductivity and Phonon Softening in Mono- and Bilayer MoS${}_2$
• Observation of coexisting weak localization and superconducting fluctuations in strained Sn1-xInxTe thin films
• Switch effect and $0$-$\pi$ transition in Ising superconductor Josephson junctions
• Multiple odd-parity superconducting phases in bilayer transition metal dichalcogenides
• Gate-controlled supercurrent reversal in MoS${}_2$-based Josephson junctions
• Spin-triplet $f$-wave symmetry in superconducting monolayer $Mo{S}_2$
• Strong band-filling-dependence of the scattering lifetime in gated MoS2 nanolayers induced by the opening of intervalley scattering channels
• Impurity-Induced Anomalous Thermal Hall Effect in Chiral Superconductors
• Asymmetric Andreev resonant state with a magnetic exchange field in spin-triplet superconducting monolayer $Mo{S}_2$