Kondo excitons in self-assembled quantum dots

Details Kondo excitons in self-assembled quantum dots Kondo excitons in self-assembled quantum dots

2002-11-08

arxiv.org/abs/cond-mat/0211155v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 4 figures

Scientific paper

10.1103/PhysRevB.67.241307

We describe novel excitons in quantum dots by allowing for an interaction with a Fermi sea of electrons. We argue that these excitons can be realized very simply with self-assembled quantum dots, using the wetting layer as host for the Fermi sea. We show that a tunnel hybridization of a charged exciton with the Fermi sea leads to two striking effects in the optical spectra. First, the photoluminescence lines become strongly dependent on the vertical bias. Secondly, if the exciton spin is nonzero, the Kondo effect leads to peculiar photoluminescence line shapes with a line width determined by the Kondo temperature.

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