Abstract
AbstractWe have investigated the conduction and the valence band states of self‐assembled InAs quantum dots embedded in n‐ and p‐type Schottky diodes, respectively, by magneto‐capacitance voltage spectroscopy. The dispersion behaviour of the individual charging peaks in a perpendicular magnetic field shows qualitative differences between the two carrier types. By applying an in‐plane magnetic field, the momentum space wave function corresponding to the individual charging peaks could be mapped. For electrons, the s‐like wave function for the ground state is slightly asymmetric with the low energy direction along [0$ \bar 1 $1] in real space. Also the s‐like wave function for the hole ground state is asymmetric but here the low energy direction is along [011], i.e. orthogonal to that for electrons. This hints to an asymmetry in the confinement potential that is caused by piezoelectric effects. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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