SUBBAND DENSITIES IN QUANTUM-WELLS UNDER INPLANE MAGNETIC-FIELDS

The dependence of the subband densities in a potential well with tunab le symmetry on a weak in-plane magnetic field is investigated experime ntally by analyzing Shubnikov-de Haas oscillations. We measure a stron g carrier redistribution between the subbands, which is explained by i ndividual mngnetic-field-dependent density of states in different subb ands rather than by the diamagnetic energy shift. The measured carrier redistribution is quantitatively explained considering the in-plane f ield in second-order perturbation theory. [S0163-1829(98)07927-2].