Theory of nonlinear optical response of ensembles of double quantum dots

Anna Sitek and Paweł Machnikowski
Phys. Rev. B 80, 115301 – Published 1 September 2009

Abstract

We study theoretically the time-resolved four-wave mixing (FWM) response of an ensemble of pairs of quantum dots undergoing radiative recombination. At short (picosecond) delay times, the response signal shows beats that may be dominated by the subensemble of resonant pairs, which gives access to the information on the interdot coupling. At longer delay times, the decay of the FWM signal is governed by two rates which result from the collective interaction between the two dots and the radiation modes. The two rates correspond to the subradiant and super-radiant components in the radiative decay. Coupling between the dots enhances the collective effects and makes them observable even when the average energy mismatch between the dots is relatively large.

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  • Received 18 March 2009

DOI:https://doi.org/10.1103/PhysRevB.80.115301

©2009 American Physical Society

Authors & Affiliations

Anna Sitek* and Paweł Machnikowski

  • Institute of Physics, Wrocław University of Technology, 50-370 Wrocław, Poland

  • *anna.sitek@pwr.wroc.pl
  • pawel.machnikowski@pwr.wroc.pl

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Issue

Vol. 80, Iss. 11 — 15 September 2009

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