Correlation Effects on the Coupled Plasmon Modes of a Double Quantum Well

TL;DR

This paper investigates how correlation effects influence coupled plasmon modes in a double quantum well system, using experimental measurements of Coulomb drag and comparing results with theoretical models to understand many-body interactions.

Contribution

It provides the first detailed experimental comparison of many-body corrections to coupled plasmon modes with local field theory predictions in a double quantum well system.

Findings

Observation of plasmon-enhanced Coulomb drag at high temperatures

Identification of a crossover from collective to single-particle Coulomb scattering with magnetic field

Validation of local field theories in describing many-body effects in coupled plasmon modes

Abstract

At temperatures comparable to the Fermi temperature, we have measured a plasmon enhanced Coulomb drag in a GaAs/AlGaAs double quantum well electron system. This measurement provides a probe of the many-body corrections to the coupled plasmon modes, and we present a detailed comparison between experiment and theory testing the validity of local field theories. Using a perpendicular magnetic field to raise the magnetoplasmon energy we can induce a crossover to single-particle Coulomb scattering.