Transport properties of spin-triplet superconducting monolayer MoS2

Abstract

The quantum transport properties of graphene and monolayer MoS2 superconductor heterostructures have been of considerable importance in the last few years. Layered nature of molybdenum disulfide permits the superconducting correlation induction. Moreover, peculiar dynamical features of monolayer MoS2, such as valence band spin splitting in the nondegenerate K and K′ valleys originated from strong spin-orbit coupling, and considerable direct band gap can make it potentially a useful material for electronics applications. Using the Dirac-like Hamiltonian of MoS2, with taking into account the related mass asymmetry and topological contributions, we investigate the effect of spin-triplet p-wave pairing symmetry on the superconducting excitations, resulting in the Andreev reflection process and Andreev bound state in the corresponding normal-superconductor (NS) and superconductor-normal-superconductor (SNS) structures, respectively. We study how the resulting subgap conductance and Josephson current are affected by the particular symmetry of order parameter. The signature of px-wave symmetry is found to decline the subgap superconducting energy excitations and, consequently, slightly suppress the Andreev reflection in the case of the p-doped S region. The essential dynamical parameters λ and β of MoS2 have significant effect on the both tunneling conductance and Josephson current. Particularly, the considered p-wave symmetry in the superconducting bound energies may feature the zero energy states at the interfaces. The critical current oscillations as a function of length of junction are obtained in the p-doped S region.

Source-reported materials — not catalogue approval

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