Monte Carlo model for the photoluminescence kinetics of a quantum dot embedded in a nanocavity

• Presented at: 16th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures (EDISON 16), Montpellier, FRANCE, AUG 24-28, 2009
• Published in: Journal of Physics: Conference Series, vol. 193, p. 012124
• Series: Journal of Physics Conference Series
• Iop Publishing Ltd, Dirac House, Temple Back, Bristol Bs1 6Be, England, 2009

We address the problem of the photoluminescence of a quantum (QD) dot in a nanocavity, with focus on the case of nonzero detuning. In this regime, experiments have shown that strong emission from the cavity-like peak is still present for dot-cavity detuning exceeding 10 meV, which seems puzzling. We will discuss the general theory of cavity feeding, due to the relaxation and recombination kinetics of a multiply excited QD. We first compute the multi-exciton manifolds using a configuration-interaction scheme, starting from a truncated single-particle basis. We then run Monte-Carlo paths of excitation-emission kinetics on these states. This allows to extract photoluminescence spectra and two-photon correlation curves. The agreement with experimental data[1, 2] is very good. Our result shows unambiguously that the cavity feeding mechanism at large detunings can be attributed to excited-state multiexciton radiative decay (mostly biexcitons), also involving states in the wetting layer continuum.

Note: 16th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures (EDISON 16). Montpellier, FRANCE, AUG 24-28, 2009

Keywords: Exciton ; Quantum Dot ; Cavity Quantum Electrodynamics ; Optical Properties ; Photoluminescence ; Cavity Feeding ; Semiconductor

Reference

• EPFL-CONF-150119
• doi:10.1088/1742-6596/193/1/012124
• View record in Web of Science

• URL: http://www.iop.org/EJ/abstract/-search=67395029.1/1742-6596/193/1/012124

Record created on 2010-07-22, modified on 2012-03-19