Spin Coulomb drag beyond the random phase approximation

TL;DR

This paper investigates the spin Coulomb drag in a quasi-two-dimensional electron gas beyond the RPA, revealing that many-body effects significantly influence the drag and align theory with experimental results.

Contribution

It introduces a beyond-RPA approach that accounts for finite width and local field effects, improving the theoretical understanding of spin Coulomb drag.

Findings

Finite width reduces spin Coulomb drag

Many-body local field effects restore agreement with experiments

Beyond-RPA modeling improves accuracy of spin drag predictions

Abstract

We study the spin Coulomb drag in a quasi-two-dimensional electron gas beyond the random phase approximation (RPA). We find that the finite transverse width of the electron gas causes a significant reduction of the spin Coulomb drag. This reduction, however, is largely compensated by the enhancement coming from the inclusion of many-body local field effects beyond the RPA, thereby restoring good agreement with the experimental observations by C. P. Weber \textit{et al.}, Nature, \textbf{437}, 1330 (2005).