Pure spin-current generated by reflection at a normal metal/2DEG interface

TL;DR

This paper proposes a method to generate pure transverse spin-currents using scattering at a normal metal/2DEG interface, effective for systems with strong spin-orbit coupling, and suggests an experimental setup for observation.

Contribution

It introduces a novel approach to produce pure spin-currents in normal metals via interface scattering, overcoming issues related to spin-orbit coupling effects.

Findings

Unpolarized charge current induces transverse spin-current.

Applicable to systems with Rashba and Dresselhaus spin-orbit coupling.

Experimental setup for observing the effect is proposed.

Abstract

The concept of a spin-current is a useful tool in understanding spin-transport in hybrid systems, but its very definition is problematic in systems where spin-orbit coupling effects are strong. In the absence of spin-dependent scattering, the spin-current remains well-defined. We here propose a method for generating pure spin-currents in a normal metal where the spin-current consequently does not suffer from the aforementioned problems pertaining to its very definition or spin-relaxation processes. More specifically, we show how an unpolarized incident charge-current can induce a pure transverse spin-current by means of scattering at a normal metal/2DEG interface. This occurs for both Rashba and Dresselhaus spin-orbit coupling. An experimental setup for observation of this effect is proposed.