Abstract

The dependence of the subband densities in a potential well with tunable symmetry on a weak in-plane magnetic field is investigated experimentally by analyzing Shubnikov--de Haas oscillations. We measure a strong carrier redistribution between the subbands, which is explained by individual magnetic-field--dependent density of states in different subbands rather than by the diamagnetic energy shift. The measured carrier redistribution is quantitatively explained considering the in-plane field in second-order perturbation theory.

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