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

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

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.

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M. R. Schaapman, U. Zeitler, P. C. M. Christianen, J. C. Maan, D. Reuter, A. D. Wieck, D. Schuh, M. Bichler. 2003-08-25. Magnetization of a two-dimensional electron gas with a second filled subband. https://doi.org/10.1103/physrevb.68.193308

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