Giant Efficiency of Fröhlich Interaction in Self-Assembled Quantum Dots

Authors : A W E MINNAERT, A Yu SILOV, J E M HAVERKORT, J H WOLTER

Pages : 631-634

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :A transition is being observed from an inhomogeneously broadened photoluminescence band under non-resonant excitation of InAs/GaAs Self-Assembled quantum Dots insert ignore into journalissuearticles values(SAD`s); into up to five phonon-assisted emission bands under selective excitation. A similar effect is obtained from photoluminescence excitation experiments insert ignore into journalissuearticles values(PLE);. We interpret the phonon-assisted PL as being due to a giant efficiency of the Fröhlich interaction between an exciton polarized by strain in the SAD and LO-phonons. The model is consistent with the pronounced p-type polarization of the emission observed in our cleaved-side PL-measurements. Further support is obtained from our calculations in which a different localization of the electrons and holes is assumed: The limiting case of this theoretical framework gives a Huang-Rhys factor of \sim 0.1, which is the same order of magnitude as the experimental value.
Keywords : Turk J Phys, 23, 1999, 631 634 Turk J Phys, vol 23, iss 4