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HL: Halbleiterphysik

HL 41: Quantenpunkte und -dr
ähte: Optische Eigenschaften II

HL 41.4: Talk

Thursday, March 27, 2003, 11:45–12:00, POT/81

Theory of vertical and lateral Stark shifts of excitons in quantum dots — •Matthias Sabathil, Stefan Hackenbuchner, Stefan Birner, Jacek Majewski, Peter Vogl, and Jonathan Finley — Walter Schottky Institut, Technische Universitaet Muenchen, Am Coulombwall, 85748 Garching, Germany

We present charge self-consistent 8-band kp calculations of the quantum confined Stark shift of excitons for self-assembled buried InGaAs quantum dots. Many different shapes and alloy profiles of the dots have been systematically studied. We predict the Stark shift of excitons for simultaneously applied vertical and lateral electric fields, taking into account realistic alloy profiles in the quantum dot. The study of the Stark shift of neutral excitons and in both vertical and lateral electric field directions provides a wealth of in-formation about the coupling of the exciton to external perturbations. We show that the combination of lateral and vertical electric fields provides a particularly sensitive probe of the dot shape and alloy composition.