Influence of the pulse shape and the dot size on the decay and reappearance of Rabi rotations in laser driven quantum dots

Titelangaben

Glässl, Martin ; Croitoru, Mikhail D. ; Vagov, Alexei ; Axt, Vollrath Martin ; Kuhn, Tilmann:
Influence of the pulse shape and the dot size on the decay and reappearance of Rabi rotations in laser driven quantum dots.
In: Physical Review B. Bd. 84 (2011) Heft 12 . - 125304.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.84.125304

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Abstract

We study the dynamics of strongly confined semiconductor quantum dots coupled to acoustic phonons and driven by external laser pulses by a numerical path integral method. The field-dependent damping, caused by the non-Markovian processes of pure dephasing and manifesting itself in the peculiar decay and reappearance phenomenon of Rabi rotations is found to depend notably on the dot size and the shape of the applied laser pulses. In the limit of strong fields rectangular pulses yield a significant weaker damping than Gaussian or other bell-shaped profiles. As a consequence, the undamping of Rabi rotations at high pulse areas is most clearly visible for rectangular pulses.