Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 70: Quantum Dots and Wires: Theory
HL 70.10: Vortrag
Donnerstag, 17. März 2011, 12:45–13:00, POT 151
Semiconductor theory for single quantum dot emitters — •Matthias Florian1, Paul Gartner1,2, Christopher Gies1, and Frank Jahnke1 — 1Institute for Theoretical Physics, University of Bremen, Germany — 2National Institute of Materials Physics, Bucharest-Magurele, Romania
The controlled interaction of a single quantum-dot (QD) emitter with a single mode of the confined electromagnetic field is one of the recent remarkable achievements in cavity quantum-electrodynamics. The discrete level structure of QDs and the similarity to atomic systems has been widely used by invoking atomic models to describe QD-systems. But QDs are significantly different due to multiple carriers in the system and a reduced configuration interaction strength. This leads to several configurations, which are energetically close by and involved in the same interaction process. Moreover, typical excitation of carriers in the continuum states of the wetting layer or barrier material can introduce excitation-induced screening and dephasing. To analyze the quantum-mechanical interaction processes, we propose a microscopic theory based on a direct numerical solution of the von-Neumann equation for the coupled carrier-photon system. The Coulomb interaction as well as carrier scattering and dephasing processes are included and their influence on the statistical properties of the emitted photons like coherence, antibunching, and quenching are discussed.