Biexciton state preparation in a quantum dot via adiabatic rapid passage : Comparison between two control protocols and impact of phonon-induced dephasing

Titelangaben

Glässl, Martin ; Barth, Andreas M. ; Gawarecki, Krzysztof ; Machnikowski, Paweł ; Croitoru, Mikhail D. ; Lüker, Sebastian ; Reiter, Doris ; Kuhn, Tilmann ; Axt, Vollrath Martin:
Biexciton state preparation in a quantum dot via adiabatic rapid passage : Comparison between two control protocols and impact of phonon-induced dephasing.
In: Physical Review B. Bd. 87 (2013) Heft 8 . - 085303.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.87.085303

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Abstract

We investigate theoretically under what conditions a stable and high-fidelity preparation of the biexciton state in a quantum dot can be realized by means of adiabatic rapid passage in the presence of acoustic phonon coupling. Our analysis is based on a numerically complete real-time path-integral approach and comprises two different schemes of optical driving using frequency-swept (chirped) pulses. We show that depending on the size of the biexciton binding energy, resonant two-photon excitations or two-color schemes can be favorable. It is demonstrated that the carrier-phonon interaction strongly affects the efficiency of both protocols and that a robust preparation of the biexciton is restricted to positive chirps and low temperatures. A considerable increase of the biexciton yield can be achieved realizing temperatures below 4 K.