Spin mechanism of drag resistance in strongly correlated electron liquids

TL;DR

This paper explores how spin diffusion and plasmon resonances contribute to drag magnetoresistance in strongly correlated, partially spin-polarized electron liquids, using a nonperturbative hydrodynamic approach.

Contribution

It introduces a novel hydrodynamic framework to analyze drag magnetoresistance in strongly correlated electron liquids without assuming Fermi-liquid behavior.

Findings

Drag magnetoresistance arises from spin current fluctuations.

Plasmon resonances enhance the drag effect.

Results are valid for highly correlated and semi-quantum fluids.

Abstract

We investigate the effect of Coulomb drag resistance in a bilayer system of strongly correlated electron liquids magnetized by an in-plane field employing the framework of hydrodynamic theory. We identify a mechanism for drag magnetoresistance, which physically arises from the spin diffusion driven by fluctuations of the spin currents within a partially spin-polarized fluid. This effect is further enhanced by acoustic and optic plasmon resonances within the bilayer, where hydrodynamic plasmons are driven by fluctuating viscous stresses. We express the drag magnetoresistivity in terms of the intrinsic dissipative coefficients and basic thermodynamic properties of the electron fluid. Our results are derived nonperturbatively in interaction strength and do not rely on assuming Fermi-liquid behavior of the electron liquid, and applicable also in the regimes of semiquantum and highly correlated classical fluids.