Magnetization of a two-dimensional electron gas with a second filled subband
M. R. SchaapmanNijmegen Science Research Institute of Matter, High Field Magnet Laboratory, University of Nijmegen, Toernooiveld 7, 6525 ED Nijmegen, The NetherlandsU. ZeitlerNijmegen Science Research Institute of Matter, High Field Magnet Laboratory, University of Nijmegen, Toernooiveld 7, 6525 ED Nijmegen, The NetherlandsPeter C. M. ChristianenNijmegen Science Research Institute of Matter, High Field Magnet Laboratory, University of Nijmegen, Toernooiveld 7, 6525 ED Nijmegen, The NetherlandsJ.C. MaanNijmegen Science Research Institute of Matter, High Field Magnet Laboratory, University of Nijmegen, Toernooiveld 7, 6525 ED Nijmegen, The NetherlandsD. ReuterNijmegen Science Research Institute of Matter, High Field Magnet Laboratory, University of Nijmegen, Toernooiveld 7, 6525 ED Nijmegen, The NetherlandsAndreas D. WieckNijmegen Science Research Institute of Matter, High Field Magnet Laboratory, University of Nijmegen, Toernooiveld 7, 6525 ED Nijmegen, The NetherlandsD. SchuhNijmegen Science Research Institute of Matter, High Field Magnet Laboratory, University of Nijmegen, Toernooiveld 7, 6525 ED Nijmegen, The NetherlandsM. BichlerNijmegen Science Research Institute of Matter, High Field Magnet Laboratory, University of Nijmegen, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
2003en
ABI
Annotatsiya
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 $1{\ensuremath{\mu}}_{\mathrm{B}}^{*}$ per electron. All three effects are explained by a field-dependent self-consistent model, demonstrating that 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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