Enhanced Polar Exciton-LO-Phonon Interaction in Quantum Dots

R. Heitz; I. Mukhametzhanov; O. Stier; A. Madhukar; D. Bimberg

doi:10.1103/PhysRevLett.83.4654

Enhanced Polar Exciton-LO-Phonon Interaction in Quantum Dots

R. Heitz, I. Mukhametzhanov, O. Stier, A. Madhukar, and D. Bimberg

Phys. Rev. Lett. 83, 4654 – Published 29 November 1999

Abstract

Phonon-assisted exciton transitions in self-organized InAs/GaAs quantum dots (QDs) are investigated by photoluminescence (PL) and PL excitation spectroscopy. An unexpectedly enhanced polar exciton-LO-phonon interaction for such strained low-symmetry QDs is found. Calculations in the adiabatic approximation indicate that the particular quantum confinement and piezoelectric effect together account for the enhanced coupling. The results provide new insights into the long-standing problem of the exciton-phonon interaction in zero-dimensional systems.

Received 19 April 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.4654

Authors & Affiliations

R. Heitz^1,2, I. Mukhametzhanov², O. Stier¹, A. Madhukar², and D. Bimberg¹

¹Institut für Festkörperphysik, Technische Universität Berlin, Berlin, Germany
²Photonic Materials and Devices Laboratory, University of Southern California, Los Angeles, California 90089