Leifer, K. and Pelucchi, E. and Watanabe, S. and Michelini, F. and Dwir, B. and Kapon, E.

2007

Applied Physics Letters

Narrow (approximate to 4 meV) inhomogeneous broadening and its correlation with confinement potential of pyramidal quantum dot arrays

Validated

()

91

8

The inhomogeneous broadening in the luminescence spectra of ordered arrays of pyramidal GaAs/AlGaAs semiconductor quantum dots (QDs) was studied as a function of the dot size. Dot arrays with inhomogeneous broadening as small as 4.1 meV and a corresponding ground state to first excited state transition separation of 28 meV were obtained. By evaluating the QD energy levels using a multiband k center dot p model, the authors estimated that the observed inhomogeneous broadening corresponds to dot height fluctuations of about 1-2 ML across the array.(c) 2007 American Institute of Physics.