Magnetization of a two-dimensional electron gas with a second filled subband

Schaapman, M. R.; Zeitler, U.; Christianen, P. C. M.; Maan, J. C.; Reuter, D.; Wieck, A. D.; Schuh, D.; Bichler, M.

Magnetization of a two-dimensional electron gas with a second filled subband

Authors

Schaapman, M. R.

Zeitler, U.

Christianen, P. C. M.

Description

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 $1 μ_{\mathrm{B}}^*$ 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.
4 pages, 4 figures