Many-body correlations probed by plasmon-enhanced drag measurements in double quantum well structures

TL;DR

This study measures electron-electron scattering rates in double quantum wells near the Fermi temperature, revealing plasmon enhancement effects and highlighting the need to include multiparticle correlations beyond standard approximations.

Contribution

It provides experimental evidence of plasmon-enhanced electron drag and emphasizes the importance of multiparticle excitations in theoretical models.

Findings

Evidence of plasmon enhancement in electron drag rates

Differences observed between experiments and RPA-based calculations

Correlation-induced multiparticle excitations are necessary for accurate modeling

Abstract

Electron drag measurements of electron-electron scattering rates performed close to the Fermi temperature are reported. While evidence of an enhancement due to plasmons, as was recently predicted [K. Flensberg and B. Y.-K. Hu, Phys. Rev. Lett. 73, 3572 (1994)], is found, important differences with the random-phase approximation based calculations are observed. Although static correlation effects likely account for part of this difference, it is argued that correlation-induced multiparticle excitations must be included to account for the magnitude of the rates and observed density dependences.