Spin-Dependent Conductance in a Junction with Dresselhaus Spin-Orbit Coupling

TL;DR

This paper compares spin-dependent conductance in metal junctions with Dresselhaus and Rashba spin-orbit couplings, revealing conditions under which their conductances are equivalent, especially considering magnetization directions.

Contribution

It provides a detailed analysis of conductance behavior in junctions with DSOC and RSOC, highlighting the conditions for their equivalence and differences based on magnetization orientation.

Findings

Conductance in DSOC equals RSOC in NM/FSOM junctions.

In FM/FSOM junctions, conductance equivalence depends on magnetization direction.

Gate-voltage influences spin-dependent conductance in both DSOC and RSOC systems.

Abstract

We studied spin-dependent conductance in a normal metal (NM)/NM junction with Dresselhaus spin-orbit coupling (DSOC) and magnetization. As a reference, we also studied the spin-dependent conductance in such a junction with Rashba spin-orbit coupling (RSOC). Using a standard scattering method, we calculated the gate-voltage dependence of the spin-dependent conductances in DSOC and RSOC. In addition, we calculated the gate-voltage dependence of the conductances in a ferromagnetic metal (FM)/NM junction with spin-orbit coupling and magnetization, which we call ferromagnetic spin-orbit metal (FSOM). From these results, we discuss the relation between these conductance in the presence of DSOC and that in the presence of RSOC. We found that conductance in DSOC is the same as that in RSOC for the NM/FSOM junction. In addition, we found that in the FM/FSOM junction, the conductance in DSOC is the same as that in RSOC only when the FM magnetization is along the out-of-plane direction.