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Kondo-excitons and Auger processes in self-assembled quantum dots

Published online by Cambridge University Press:  11 February 2011

A. O. Govorov,
K. Karrai,
R. J. Warburton and
A. V. Kalameitsev
A. O. Govorov
Affiliation:
Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USAInstitute of Semiconductor Physics, 630090 Novosibirsk, Russia
K. Karrai
Affiliation:
Center for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität, 80539 München, Germany
R. J. Warburton
Affiliation:
Department of Physics, Heriot-Watt University, Edinburgh EH14 4AS, UK
A. V. Kalameitsev
Affiliation:
Institute of Semiconductor Physics, 630090 Novosibirsk, Russia
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Abstract

We describe theoretically novel excitons in self-assembled quantum dots interacting with a two-dimensional (2D) electron gas in the wetting layer. In the presence of the Fermi sea, the optical lines become strongly voltage-dependent. If the electron spin is nonzero, the width of optical lines is given by kBTK, where TK is Kondo temperature. If the spin is zero, the exciton couples with the continuum due to Auger-like processes. This leads to anticrossings in a magnetic field. Such states can be called Kondo-Anderson excitons. Some of the described phenomena are observed in recent experiments.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 737 , 2002, E12.5
Copyright
Copyright © Materials Research Society 2003

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