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

B. Krummheuer, V. M. Axt, and T. Kuhn
Phys. Rev. B 72, 245336 – Published 29 December 2005

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.

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  • Received 30 June 2005

DOI:https://doi.org/10.1103/PhysRevB.72.245336

©2005 American Physical Society

Authors & Affiliations

B. Krummheuer*, V. M. Axt, and T. Kuhn

  • Institut für Festkörpertheorie, Westfälische Wilhelms-Universität, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany

  • *Email address: krummheu@nwz.uni-muenster.de

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Issue

Vol. 72, Iss. 24 — 15 December 2005

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