Abstract

Using frequency- and time-domain nonlinear optical spectroscopy we investigate a new type of disordered system consisting of an ensemble of quantum dots in a narrow (less than 50 Å) GaAs quantum well. The quantum well is MBE grown with a two-minute growth interruption at each well-barrier interface. Gammon et al. have shown that the lateral sizes of dots in such a quantum well typically exceed the exciton Bohr radius in bulk (150 Å) and that each dot is well isolated from others.¹ Thus this system exhibits exciton-localization properties unlike those in previously investigated disordered quantum wells whose disorder length scales were smaller than the Bohr radius.

© 1997 Optical Society of America