Adiabatic rapid passage in quantum dots : phonon-assisted decoherence and biexciton generation

Titelangaben

Gawarecki, Krzysztof ; Lüker, Sebastian ; Reiter, Doris ; Kuhn, Tilmann ; Glässl, Martin ; Axt, Vollrath Martin ; Grodecka-Grad, Anna ; Machnikowski, Paweł:
Adiabatic rapid passage in quantum dots : phonon-assisted decoherence and biexciton generation.
In: Physica Status Solidi C. Bd. 10 (2013) Heft 9 . - S. 1210-1213.
ISSN 1610-1642
DOI: https://doi.org/10.1002/pssc.201200746

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Abstract

We study the evolution of a quantum dot controlled by a frequency-swept (chirped), linearly polarized laser pulse in the presence of carrier-phonon coupling. The final occupation of the exciton state is limited both due to phonon-induced transitions between the adiabatic spectral branches and because of phonon-assisted transitions to the biexcitostate.When the biexciton shift is large enough, the quantum dot can be modeled as a two-level system, which corresponds to excitation with circularly polarized light. For this case, we compare different methods of simulations: (i) a time convolutionless method, (ii) correlation expansion and (iii) path integrals. We show that results obtained from these methods agree perfectly at temperatur. (© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)