Dephasing Times in a Non-degenerate Two-Dimensional Electron Gas

TL;DR

This paper investigates the dephasing times of electrons in a non-degenerate two-dimensional electron gas on liquid helium, focusing on effects from vapor atom scattering and electron-electron interactions.

Contribution

It provides a detailed analysis of how vapor atom motion and electron density influence dephasing times in a 2D electron system on liquid helium.

Findings

Dephasing by vapor atom motion varies with atom velocity perpendicular to the surface.

Vapor density affects quasi-elastic scattering length and dephasing.

Electron-electron interactions contribute to dephasing depending on electron density.

Abstract

Studies of weak localization by scattering from vapor atoms for electrons on a liquid helium surface are reported. There are three contributions to the dephasing time. Dephasing by the motion of vapor atoms perpendicular to the surface is studied by varying the holding field to change the characteristic width of the electron layer at the surface. A change in vapor density alters the quasi-elastic scattering length and the dephasing due to the motion of atoms both perpendicular and parallel to the surface. Dephasing due to the electron-electron interaction is dependent on the electron density.