Coupled polarization and acoustic-phonon dynamics after optical excitation of quantum dots near surfaces

Titelangaben

Krummheuer, B. ; Axt, Vollrath Martin ; Kuhn, Tilmann:
Coupled polarization and acoustic-phonon dynamics after optical excitation of quantum dots near surfaces.
In: Physical Review B. Bd. 72 (2005) Heft 24 . - 245336.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.72.245336

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Abstract

An analysis of the pure dephasing of a single quantum dot embedded in a half-space or a free-standing slab due to the interaction of the carriers with confined acoustic phonons is presented. We discuss the time dependence of the polarization and the relative volume change based on exact expressions which hold for ultrafast excitation. We find that the proximity of the quantum dot to a surface leaves distinct traces in the polarization and in the case of the half-space leads to an additional decay. In the case of the slab the polarization shows a pronounced periodic structure depending on the width of the slab.