Coulomb-interaction driven anomaly in the Stark effect for an exciton in vertically coupled quantum dots

Abstract The effect of the electric field on an exciton confined in a pair of vertically coupled quantum dots is studied. We use a single-band approximation and a parabolic model potential. As a result of these idealizations, we obtain a numerically solvable model, which is used to describe the influence of the electron-hole interaction on the Stark effect for the lowestenergy photoluminescence lines. We show that for intermediate tunnel coupling between the dots this interaction leads to an anomalous Stark effect with an essential deviation of the recombination energy from the usual quadratic dependence on the electric field. Self-assembled InAs/GaAs quantum dots grown on subsequent layers stack one above the other In this paper, we investigate the role of the electron-hole interaction in the Stark shift of the photoluminescence lines. For this purpose we use a model of coupled quantum dots, which-due to its ARTICLE IN PRESS www.elsevier.com/locate/jlumin 0022-2313/$ -see front matter