Transport signatures of top-gate bound states with strong Rashba-Zeeman effect

TL;DR

This paper proposes a spin injection method in quantum channels with strong Rashba and Zeeman effects, revealing transport signatures of bound states influenced by top-gate potential and length.

Contribution

It introduces a novel single-mode spin injection scheme exploiting Rashba-Zeeman interactions and top-gate control to observe bound state signatures in quantum channels.

Findings

Transport signatures depend on top-gate length.

Coherent destruction of quasi-bound states observed.

Sensitive to top-gate potential and geometry.

Abstract

We suggest a single-mode spin injection scheme in non-ferromagnetic quantum channels utilizing perpendicular strong Rashba spin-orbit and Zeeman fields. By applying a positive top-gate potential in order to inject electrons from the spin-orbit gap to the low-energy regime, we observe coherent destruction of transport signatures of a hole-like quasi-bound state, an electron-like quasi-bound state, or a hole-like bound state features that are sensitive to the selection of the top-gate length along the transport direction.