Interaction effects on magnetooscillations in a two-dimensional electron gas

TL;DR

This paper investigates how electron interactions affect magnetooscillations in a 2D electron gas, emphasizing the role of effective mass renormalization across different temperature regimes.

Contribution

It provides a comprehensive calculation of interaction-induced damping effects on magnetooscillations, highlighting the importance of effective mass corrections in 2DEG.

Findings

Interaction corrections significantly influence magnetooscillation damping.

Effective mass renormalization dominates the damping effects.

Results aid in interpreting experimental data on high-mobility 2DEG.

Abstract

Motivated by recent experiments, we study the interaction corrections to the damping of magnetooscillations in a two-dimensional electron gas (2DEG). We identify leading contributions to the interaction-induced damping which are induced by corrections to the effective mass and quantum scattering time. The damping factor is calculated for Coulomb and short-range interaction in the whole range of temperatures, from the ballistic to the diffusive regime. It is shown that the dominant effect is that of the renormalization of the effective electron mass due to the interplay of the interaction and impurity scattering. The results are relevant to the analysis of experiments on magnetooscillations (in particular, for extracting the value of the effective mass) and are expected to be useful for understanding the physics of a high-mobility 2DEG near the apparent metal-insulator transition.