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
A. GARCIA
V. N. GLADILIN
V. M. FOMN
J. T. DEVREESE

Abstract

A transition is being observed from an inhomogeneously broadened photoluminescence band under non-resonant excitation of InAs/GaAs Self-Assembled quantum Dots (SAD's) into up to five phonon-assisted emission bands under selective excitation. A similar effect is obtained from photoluminescence excitation experiments (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.

DOI

-

First Page

631

Last Page

634

Recommended Citation

MINNAERT, A. W, SILOV, A. Y, HAVERKORT, J. E, WOLTER, J. H, GARCIA, A, GLADILIN, V. N, FOMN, V. M, & DEVREESE, J. T (1999). Giant Efficiency of Fröhlich Interaction in Self-Assembled Quantum Dots. Turkish Journal of Physics 23 (4): 631-634. https://doi.org/-