Asymmetric Andreev resonant state with a magnetic exchange field in spin-triplet superconducting monolayer $Mo{S}_2$

Abstract

Featuring spin-valley degree of freedom by a magnetic exchange field-induction to gain transport of charge carriers through a junction based on superconducting subgap tunneling can provide a new scenario for future electronics. Transmission of low-energy Dirac-like electron (hole) quasiparticles through a ferromagnet/superconductor (F/S) interface can be of noticeable importance due to strong spin-orbit coupling in the valence band of monolayer $Mo{S}_2$ (ML-MDS). The magnetic exchange field (MEF) of a ferromagnetic section on top of ML-MDS may affect the electron (hole) excitations for spin-up and spin-down electrons, differently. Tuning the MEF enables one to control either electrical properties (such as band gap, SOC and etc.) or spin-polarized transport. We study the influence of MEF on the chirality of Andreev resonant state (ARS) appearing at the relating F/S interface, in which the induced pairing order parameter is chiral $p$-wave symmetry. The resulting normal conductance is found to be more sensitive to the magnitude of MEF and doping regime of F region. Unconventional spin-triplet $p$-wave symmetry features the zero-bias conductance, which strongly depends on $p$-doping level of F region in the relating NFS junction.

11 pages, 7 figures

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