Density dependent spin susceptibility and effective mass in interacting quasi-two dimensional electron systems

TL;DR

This paper presents a Fermi liquid many-body calculation of how interactions affect spin susceptibility and effective mass in realistic 2D electron systems, aligning well with recent experiments and highlighting open questions.

Contribution

It provides a theoretical framework for understanding interaction effects on spin susceptibility and effective mass in 2D systems using the ladder-bubble approximation.

Findings

Quantitative agreement with recent experimental measurements.

Interaction effects significantly modify spin susceptibility and effective mass.

Open questions remain about the quantitative accuracy at low densities.

Abstract

Motivated by recent experimental reports, we carry out a Fermi liquid many-body calculation of the interaction induced renormalization of the spin susceptibility and effective mass in realistic two dimensional (2D) electron systems as a function of carrier density using the leading-order `ladder-bubble' expansion in the dynamically screened Coulomb interaction. Using realistic material parameters for various semiconductor-based 2D systems, we find reasonable quantitative agreement with recent experimental susceptibility and effective mass measurements. We point out a number of open questions regarding quantitative aspects of the comparison between theory and experiment in low-density 2D electron systems.