Optical spectra of quantum dots: effects of non-adiabaticity

Details Optical spectra of quantum dots: effects of non-adiabaticity Optical spectra of quantum dots: effects of non-adiabaticity

2003-08-25

arxiv.org/abs/cond-mat/0308482v1

Phys. Stat. Sol. (c) 0 (2003) 1189

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, E-mail addresses: devreese@uia.ua.ac.be, fomin@uia.ua.ac.be, pokatilov@add.moldova.su, gladilin@uia.ua.ac.

Scientific paper

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.

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