Optical transitions, exciton radiative decay, and valley coherence in lead chalcogenide quantum dots
S. V. Goupalov,
E. L. Ivchenko,
M. O. Nestoklon
Abstract:We propose the concept of valley coherence and superradiance in the reciprocal space and show that it leads to an N -fold decrease of the bright exciton radiative lifetime in quantum dots (QDs) of an N -valley semiconductor. Next we explain why, despite this, the exciton radiative lifetimes in PbX (X = S, Se, Te) QDs, measured from the photoluminescence decay, are in the microsecond range. We also address peculiarities of the light-matter interaction in nanostructures made of narrow-gap materials with strong i… Show more
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