Abstract
Low-temperature photoluminescence (PL) studies of InAs self-assembled quantum dots (SAQD’s) embedded in a GaAs matrix have been performed under hydrostatic pressure up to 70 kbar. A strong blueshift of the PL line from the SAQD’s with up to 53 kbar changes to a relatively small redshift at higher This is the fingerprint of a crossover. Above the crossover pressure, we find experimental evidence for type-II band alignment in the InAs SAQD/GaAs heterostructure system. This gives a reference point that allows us to determine independently the energies of the electron and hole levels in the QD.
- Received 26 November 1997
DOI:https://doi.org/10.1103/PhysRevB.58.R4250
©1998 American Physical Society