Article ID Journal Published Year Pages File Type
1552583 Superlattices and Microstructures 2016 9 Pages PDF
Abstract

•Andreev reflection and resulting subgap conductance in a $MoS_2$-based ferromagnetic superconductor are investigated.•The accurate form of electron-hole excitations and corresponding Dirac-like spinors are exactly obtained.•we consider the difference of superconducting gap under electron-hole converting, taking place in the $d$-wave order.•Strong spin-splitting occurs in valence band of nondegenerate $K$ and $K′$ valleys due to exchange field.•Exchange energy causes a distinct behavior in Andreev process between spin-up and spin-down charge carriers.

The accurate and proper form of electron-hole excitations and corresponding Dirac-like spinors of superconducting monolayer molybdenum disulfide are exactly obtained. Andreev reflection and resulting subgap conductance in a MoS2-based ferromagnet-superconductor (F/S) junction are particularly calculated in terms of dynamical characteristics of structure. Due to the spin-splitting energy gap in the valence band and also nondegenerate K and K′ valleys, the ferromagnetic exchange energy sh can cause a distinct behavior of Andreev reflection process between spin-up and spin-down charge carriers in the different valleys. In order to occur the retro Andreev reflection, the chemical potential is necessarily fixed in a determined range. Given here one-particle superconducting bispinors enable us to explicitly involve the anisotropic superconducting gap ΔS under electron-hole conversion, i.e., taking place in d-wave asymmetry. Dependence of the Andreev process on the electron incidence angle at the interface is explicitly explored in the presence of such superconducting pair potential.

Related Topics
Physical Sciences and Engineering Materials Science Electronic, Optical and Magnetic Materials
Authors
, , ,