Theory of nonlinear optical response of ensembles of double quantum dots

Details Theory of nonlinear optical response of ensembles of double quantum dots Theory of nonlinear optical response of ensembles of double quantum dots

2009-03-16

arxiv.org/abs/0903.2784v2

Phys. Rev. B 80, 115301 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 3 figures; moderately modified

Scientific paper

10.1103/PhysRevB.80.115301

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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