Superradiance and enhanced luminescence from ensembles of a few self-assembled quantum dots

Abstract

We study the evolution of photoluminescence (PL) from homogeneous and inhomogeneous ensembles of a few coupled QDs. We discuss the relation between signals from a given QD ensemble under strong and weak excitation (full inversion and linear response regimes): A system homogeneous enough to manifest superradiant emission when strongly inverted shows a non-exponential decay of the PL signal under spatially coherent weak excitation. In an inhomogeneous ensemble the PL decay is always nearly exponential with a qualitatively different form of the time dependence in the two excitation regimes and with a higher rate under weak excitation.

5 pages, 3 figures; moderate changes and extensions

References in corpus (2)

• Collective fluorescence and decoherence of a few nearly identical quantum dots
• Interplay of coupling and superradiant emmision in the optical response of a double quantum dot

Cited by in corpus (2)

• Generalization of the Tavis-Cummings model for multi-level anharmonic systems
• The role of polaron dressing in superradiant emission dynamics