2003/08/25 by J. T. Devreese, V. M. Fomin, E. P. Pokatilov +2
Physics and Astronomy · #cond-mat.mes-hall
published as Phys. Stat. Sol. (c) 0 (2003) 1189 · 4 pages, 3 figures, E-mail addresses: [email protected], [email protected], [email protected], [email protected], [email protected]
arxiv created 2003/08/25 · arxiv updated 2009/12/01
It is shown that in many cases an adequate description of optical spectra of semiconductor quantum dots requires a treatment beyond the commonly used adiabatic approximation. We have developed a theory of phonon-assisted optical transitions in semiconductor quantum dots, which takes into account non-adiabaticity of the exciton-phonon system. Effects of non-adiabaticity lead to a mixing of different exciton and phonon states that provides a key to the understanding of surprisingly high intensities of phonon satellites observed in photoluminescence spectra of quantum dots. A breakdown of the adiabatic approximation gives an explanation also for discrepancies between the serial law, observed in multi-phonon optical spectra of some quantum dots, and the Franck-Condon progression, prescribed by the adiabatic approach.