Magnetization of a strongly interacting two-dimensional electron system in perpendicular magnetic fields

TL;DR

This study measures the thermodynamic magnetization of a strongly correlated 2D electron system in silicon under perpendicular magnetic fields, revealing how intra-level interactions influence magnetization without altering fundamental spectrum parameters.

Contribution

Introduces a new parameter-free method to directly determine spectrum characteristics in a strongly interacting 2D electron system, avoiding inter-level interaction effects.

Findings

Intra-level interactions significantly modify magnetization.

The g-factor and cyclotron mass are unaffected by intra-level interactions.

A novel measurement approach for 2D electron systems in magnetic fields.

Abstract

We measure the thermodynamic magnetization of a low-disordered, strongly correlated two-dimensional electron system in silicon in perpendicular magnetic fields. A new, parameter-free method is used to directly determine the spectrum characteristics (Lande g-factor and the cyclotron mass) when the Fermi level lies outside the spectral gaps and the inter-level interactions between quasiparticles are avoided. Intra-level interactions are found to strongly modify the magnetization, without affecting the determined g* and m*.