Inelastic Coulomb scattering rate of a multisubband Q1D electron gas

TL;DR

This paper investigates the inelastic Coulomb scattering rates in a multisubband quasi-one-dimensional electron system, revealing that plasmon excitations in the first subband dominate the scattering processes.

Contribution

It provides a detailed calculation of intrasubband and intersubband scattering rates in coupled quantum wires using a multisubband model, highlighting the role of plasmon excitations.

Findings

Plasmon excitations of the first subband are the dominant scattering mechanism.

Both intrasubband and intersubband scattering rates are quantitatively analyzed.

The study advances understanding of quasiparticle lifetimes in coupled quantum wire systems.

Abstract

In this work, the Coulomb scattering lifetimes of electrons in two coupled quantum wires have been studied by calculating the quasiparticle self-energy within a multisubband model of quasi-one-dimensional (Q1D) electron system. We consider two strongly coupled quantum wires with two occupied subbands. The intrasubband and intersubband inelastic scattering rates are caculated for electrons in different subbands. Contributions of the intrasubband, intersubband plasmon excitations, as well as the quasiparticle excitations are investigated. Our results shows that the plasmon exictations of the first subband are the most important scattering mechanism for electrons in both subbands.