1209.6234 (P. Klenovský et al.)

Electronic structure of InAs quantum dots with GaAsSb strain reducing
layer: Localization of holes and its effect on the optical properties    [PDF]

P. Klenovský, V. Křápek, D. Munzar, J. Humlíček

The electronic structure of InAs quantum dots covered with the GaAs(1-y)Sb(y) strain reducing layer has been studied using the k.p theory. We explain previous experimental observations of the red shift of the photoluminescence emission with increasing y and its blue shift with increasing excitation power. For y>0.19 type-II dots are formed with holes localized in the GaAsSb close to the dot base; two segments at opposite sides of the dot, forming molecular-like states, result from the piezoelectric field. We also propose an experiment that could be used to identify the hole localization using a vertical electric field.

View original: http://arxiv.org/abs/1209.6234