Effective mass suppression in a ferromagnetic two-dimensional electron liquid

TL;DR

This paper presents parameter-free numerical calculations showing that in a ferromagnetic two-dimensional electron system, the effective mass is suppressed at strong coupling, aligning well with recent experimental data.

Contribution

It introduces a parameter-free theoretical model that predicts effective mass suppression in ferromagnetic 2D electron systems due to charge-density fluctuations.

Findings

Effective mass is suppressed at strong coupling.

Results agree with recent experimental measurements.

The theory is free of adjustable parameters.

Abstract

We present numerical calculations of the electron effective mass in an interacting, ferromagnetic, two-dimensional electron system. We consider quantum interaction effects associated with the charge-density fluctuation induced many-body vertex corrections. Our theory, which is free of adjustable parameters, reveals that the effective mass is suppressed (relative to its band value) in the strong coupling limit, in good agreement with the results of recent experimental measurements.