Dephasing in the adiabatic rapid passage in quantum dots : Role of phonon-assisted biexciton generation

Titelangaben

Gawarecki, Krzysztof ; Lüker, Sebastian ; Reiter, Doris ; Kuhn, Tilmann ; Glässl, Martin ; Axt, Vollrath Martin ; Grodecka-Grad, Anna ; Machnikowski, Paweł:
Dephasing in the adiabatic rapid passage in quantum dots : Role of phonon-assisted biexciton generation.
In: Physical Review B. Bd. 86 (2012) Heft 23 . - 235301.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.86.235301

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Abstract

We study the evolution of an exciton confined in a quantum dot adiabatically controlled by a frequency-swept (chirped) laser pulse in the presence of carrier-phonon coupling. We focus on the dynamics induced by a linearly polarized beam and analyze the decoherence due to phonon-assisted biexciton generation. We show that if the biexciton state is shifted down by a few meV, as is typically the case, then the resulting decoherence is strong even at low temperatures. As a result, efficient state preparation is restricted to a small parameter area corresponding to low temperatures, positive chirps, and moderate pulse areas.