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Applied Physics Letters

Excitonic and biexcitonic decoherence in self-assembled GaAs quantum dots as observed by phase-locked interferography

K. Kuroda, Takashi Kuroda, Kazuaki Sakoda, K. Watanabe, N. Koguchi, G. Kido

Published Mar 20, 2006• 27 citations
Publisher

Abstract

We observe single-photon interferograms for emission of a single self-assembled GaAs quantum dot. A phase stabilizer is applied to the interferometer, enabling us to trace autocorrelations of weak emissions with a photon-counting level. At low excitation, where the average number of excitons in a dot is less than one, interferography reveals a single exponential decay, reflecting excitonic decoherence. At moderately high excitation, polarization interference between the exciton-biexciton transitions is found to appear on the interferogram. The decoherence time and the binding energy of biexcitons are determined simultaneously.

DOI
10.1063/1.2187441

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