Spintronics in MoS_2 monolayer quantum wires

TL;DR

This paper investigates spin effects in MoS_2 monolayer quantum wires, revealing helical modes, spin filtering, and potential for topological phases with Majorana fermions, combining analytical and numerical methods.

Contribution

It introduces the analysis of spin phenomena in MoS_2 quantum wires, highlighting the emergence of helical modes and topological phases induced by spin-orbit interactions and magnetic fields.

Findings

Helical modes arise from intrinsic and Rashba spin-orbit interactions.

Nearly perfect spin polarization achievable with magnetic fields.

Topological phase transition enables Majorana fermions at wire ends.

Abstract

We study analytically and numerically spin effects in MoS_2 monolayer armchair quantum wires and quantum dots. The interplay between intrinsic and Rashba spin orbit interactions induced by an electric field leads to helical modes, giving rise to spin filtering in time-reversal invariant systems. The Rashba spin orbit interaction can also be generated by spatially varying magnetic fields. In this case, the system can be in a helical regime with nearly perfect spin polarization. If such a quantum wire is brought into proximity to an s-wave superconductor, the system can be tuned into a topological phase, resulting in midgap Majorana fermions localized at the wire ends.