Abstract
This paper examines the possibility of obtaining complete gaps in the density of states of effective-mass carriers in a semiconductor, at the conduction or valence band fundamental edge. The dispersion relations are defined for waves associated with the effective-mass electrons or holes in a direct-gap material periodically modulated on a length scale significantly larger than the base crystal interatomic spacing. The specific case of cubic interacting quantum dots of Ga1−xAlxAs in a GaAs matrix is considered. A striking similarity between the effective-mass spectral density and the atomic gallium arsenide host electronic structure is found for an effective-mass superstructure derived from the zinc-blende crystal atomic arrangement. The charge carrier density has also been examined in order to shed some light on this strong similarity with atomic GaAs.
Original language | English |
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Pages (from-to) | 7133-7137 |
Number of pages | 5 |
Journal | Physical Review. B, Condensed Matter and Materials Physics |
Volume | 62 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2000 |