Double-finger-gate controlled spin-resolved resonant quantum transport in the presence of a Rashba-Zeeman gap

TL;DR

This paper explores how double finger gates can control spin-resolved quantum transport in a Rashba-Zeeman gap, revealing resonant states sensitive to gate length and bound state features unaffected by it.

Contribution

It demonstrates the tunability of resonant states in a Rashba-Zeeman system using double finger gates, highlighting the influence of gate length and the presence of bound states.

Findings

Resonant states are sensitive to DFG length in strong Rashba coupling.

Bound state features are insensitive to DFG length.

Identification of hole-like and electron-like bound states.

Abstract

We investigate double finger gate (DFG) controlled spin-resolved resonant transport properties in an n-type quantum channel with a Rashba-Zeeman (RZ) subband energy gap. By appropriately tuning the DFG in the strong Rashba coupling regime, resonant state structures in conductance can be found that is sensitive to the length of the DFG system. Furthermore, a hole-like bound state feature below the RZ gap and an electron-like quasi-bound state feature at the threshold of the upper spin branch can be found that is insensitive to the length of the DFG system.