Phonon-assisted transitions from quantum dot excitons to cavity photons

Abstract

For a single semiconductor quantum dot embedded in a microcavity, we theoretically and experimentally investigate phonon-assisted transitions between excitons and the cavity mode. Within the framework of the independent boson model we find that such transitions can be very efficient, even for relatively large exciton-cavity detunings of several millielectron volts. Furthermore, we predict a strong detuning asymmetry for the exciton lifetime that vanishes for elevated lattice temperature. Our findings are corroborated by experiment, which turns out to be in good quantitative and qualitative agreement with theory.

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• Quantum nature of a strongly-coupled single quantum dot-cavity system
• Strong-coupling of quantum dots in microcavities
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• Fast optical preparation, control and read-out of single quantum dot spin
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• Emission spectrum of a dressed exciton-biexciton complex in a semiconductor quantum dot
• Highly efficient single photon emission from single quantum dots within a two-dimensional photonic bandgap
• Quantum control of polaron states in semiconductor quantum dots

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