Andreev reflection in monolayer MoS2

Abstract

Andreev reflection in a monolayer molybdenum disulfide superconducting-normal (S/N) hybrid junction is investigated. We find, by using a modified-Dirac Hamiltonian and the scattering formalism, that the perfect Andreev reflection happens at normal incidence with $p$-doped S and N regions. The probability of the Andreev reflection and the resulting Andreev conductance, in this system, are demonstrated to be large in comparison with corresponding gapped graphene structure. We further investigate the effect of a topological term ($\beta )$ in the Hamiltonian and show that it results in an enhancement of the Andreev conductance with $p$-doped S and N regions, while in the corresponding structure with $n$-doped S region it is strongly reducible in comparison. This effect can be explained in terms of the dependence of the Andreev reflection probability on the sign of $\beta$ and the chemical potential in the superconducting region.

8 pages, 6 figures, accepted for publication in Phys. Rev. B

References in corpus (6)

• Electric Field Effect in Atomically Thin Carbon Films
• Valley polarization in MoS2 monolayers by optical pumping
• Andreev reflection and Klein tunneling in graphene
• Specular Andreev reflection in graphene
• Electron-hole transport and photovoltaic effect in gated MoS2 Schottky junctions
• Robust optical emission polarization in MoS2 monolayers through selective valley excitation

Cited by in corpus (14)

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• Valley- and spin-switch effects in molybdenum disulfide superconducting spin valve
• Valley- and spin-filter in monolayer MoS${}_2$
• Transport properties of spin-triplet superconducting monolayer $Mo{S}_2$
• Gate-controlled supercurrent reversal in MoS${}_2$-based Josephson junctions
• Pseudo-spin triplet superconductivity in transition-metal dichalcogenide monolayers and Andreev reflection in the lateral heterostructures of 2$H$-NbSe${}_2$
• Spin-triplet $f$-wave symmetry in superconducting monolayer $Mo{S}_2$
• Andreev reflection and subgap conductance in monolayer $Mo{S}_2$ ferromagnet/$s$ and $d$-wave superconductor junction
• Andreev reflection in 2D relativistic materials with realistic tunneling transparency in normal-metal-superconductor junctions
• New supercurrent pattern in quantum point contact with strained graphene nanoribbon
• Electrical and thermal transport in a twisted heterostructure of transition metal dichalcogenide and CrI${}_3$ connected to a superconductor
• Asymmetric Andreev resonant state with a magnetic exchange field in spin-triplet superconducting monolayer $Mo{S}_2$
• Transport through Nodal Surface Semimetal-Superconductor junction in absence/presence of light irradiation