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HL: Halbleiterphysik

HL 36: Optical properties

HL 36.8: Vortrag

Mittwoch, 29. März 2006, 18:00–18:15, POT 151

Theory of Photoluminescence for Semiconductor Quantum Dots — •Christopher Gies, Jan Wiersig, Norman Baer, and Frank Jahnke — Institute for Theoretical Physics, Universität Bremen, Postfach 330 440, 28334 Bremen, Germany

Semiconductor quantum dots have unique properties suited for the development of new light emitting devices. Their emission properties can be controlled to a great extent by embedding in a microcavity. Enhanced spontaneous emission and ultra-low-threshold lasers are among possible applications. Direct insight into the light-matter interaction in these systems can be gained from time-resolved photoluminescence measurements.

For an analysis of these measurements we use a theory beyond the widely established two-level atom model. In a semiconductor system, electrons and holes are in general not fully correlated, and thus, the influence of correlations should be explicitly calculated.

We present results from a microscopic quantum kinetic theory. The influence of many-body effects on the photoluminescence spectrum and decay for systems in a cavity and in free space is studied. From our results we draw conclusions upon the validity of the two-level atom approach.