Phonon-induced pure dephasing in exciton-biexciton quantum dot systems driven by ultrafast laser pulse sequences

Titelangaben

Axt, Vollrath Martin ; Kuhn, Tilmann ; Vagov, Alexei ; Peeters, F. M.:
Phonon-induced pure dephasing in exciton-biexciton quantum dot systems driven by ultrafast laser pulse sequences.
In: Physical Review B. Bd. 72 (2005) Heft 12 . - 125309.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.72.125309

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Abstract

A semiconductor quantum dot model accounting for single exciton as well as biexciton states coupled to phonons and laser light is investigated in the limit of strong electronic confinement. For an arbitrary sequence of excitations with ultrafast pulses analytical solutions are obtained for all density-matrix elements. The results are nonperturbative with respect to both the carrier-phonon and the carrier-light coupling. Numerical results for a single pulse excitation are presented illustrating spectral features of our solution as well as pulse area and temperature dependences.