We have measured the magnetization of a dual-subband two-dimensional electron gas, confined in a GaAs/AlGaAs heterojunction. In contrast to two-dimensional electron gases with a single subband, we observe non-1/B-periodic, triangularly shaped oscillations of the magnetization with an amplitude significantly less than 1μB∗ per electron. All three effects are explained by a field dependent self-consistent model, demonstrating the shape of the magnetization is dominated by oscillations in the confining potential. Additionally, at 1 K, we observe small oscillations at magnetic fields where Landau-levels of the two different subbands cross.
@article{arxiv.cond-mat/0308496,
title = {Magnetization of a two-dimensional electron gas with a second filled subband},
author = {M. R. Schaapman and U. Zeitler and P. C. M. Christianen and J. C. Maan and D. Reuter and A. D. Wieck and D. Schuh and M. Bichler},
journal= {arXiv preprint arXiv:cond-mat/0308496},
year = {2007}
}