Generation of dc spin current in a narrow channel with Rashba and Dresselhaus spin-orbit interaction

TL;DR

This paper demonstrates how a finite ac-biased gate in a quantum channel with Rashba and Dresselhaus interactions can generate a pure dc spin current through resonant inelastic scattering, with effects depending on kinetic energy.

Contribution

It introduces a method to generate pure dc spin currents using dynamical Rashba coupling in a quantum channel with combined spin-orbit effects.

Findings

Pure dc spin current is generated without charge current.

Dresselhaus effect suppresses spin current at low energies.

High kinetic energy enhances the spin current due to Dresselhaus interaction.

Abstract

We consider a finite range ac-biased front gate acting upon a quantum channel with Rashba and Dresselhaus spin-orbit interaction effects. The ac-biased gate, giving rise to a dynamical Rashba coupling, causes spin-resolved coherent resonant inelastic scattering. A pure dc spin current is subsequently generated without accompanying charge current. In the presence of Dresselhaus effect, the dc spin current is suppressed in the low kinetic energy regime but is assisted in the high kinetic energy regime.