Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-04-08
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 8 figures
Scientific paper
10.1103/PhysRevB.67.235325
The groundstate properties of an exciton in a self-assembled quantum disk are calculated in the presence of a perpendicular magnetic field. For sufficient wide and thin dots, the strain field leads to a confinement of the heavy hole within the dot and the system is type I, while the light hole is confined outside the dot and the system is type II. However, with increasing disk thickness, the strain induces a transition of the heavy hole from inside the disk towards the radial boundary outside the disk. For the exciton, we predict a heavy-hole to light-hole transition as a function of the disk thickness, i.e. forming a "ring-like" hole wavefunction. There is a range of parameters (radius and height of the disk) for which a magnetic field can induce such a heavy to light hole transition. The diamagnetic shift was compared with results from magneto-photoluminescence experiments, where we found an appreciable discrepancy. The origin of this discrepancy was investigated by varying the disk parameters, the valence band offset, and the effective masses.
Janssens K. L.
Partoens Bart
Peeters François M.
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