Photon beats from a single semiconductor quantum dot. 2001

T Flissikowski, and A Hundt, and M Lowisch, and M Rabe, and F Henneberger
Humboldt-Universität zu Berlin, Institut für Physik, Invalidenstrasse 110, D-10115 Berlin, Germany.

Single-photon interference is observed on the ultranarrow long-term stable exciton resonance of an individual semiconductor quantum dot. This interference is related to the fine-structure splitting and allows direct conclusions about the coherence properties of the exciton. When selectively addressing a particular dot by quasiresonant phonon-assisted excitation, despite a rapid orientation relaxation on a 1-ps time scale, coherence is partly maintained. No significant further decoherence occurs when the ground state is reached until the exciton recombines radiatively (approximately 300 ps).

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