The authors report on the photoluminescence spectroscopy of a single GaSbGaAs type II quantum dot (QD) at 8 K. A sharp exciton emission with a linewidth of less than 250 μeV was observed. Two-exciton emission at the higher energy side of the exciton emission indicates that the two excitons in a type II QD do not form a bound biexciton. The energies of the exciton and two-exciton states were calculated using an atomic pseudopotential model, which provides a quantitative description of the antibound nature of the two-exciton state in type II QDs.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)