Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 31: Quantum dots and wires: Optical properties III

HL 31.6: Vortrag

Mittwoch, 28. März 2007, 16:00–16:15, H17

Photon Statistics Of Semiconductor Microcavity Lasers — •Christopher Gies, Jan Wiersig, Michael Lorke, and Frank Jahnke — Institut für Theoretische Physik, Universität Bremen, Deutschland

When it comes to laser phenomena in quantum dot-based systems, usually atomic models are employed to analyze the characteristic behavior. We introduce a semiconductor theory, originating from a microscopic Hamiltonian, to describe lasing from quantum dots embedded in microcavities. The theory goes beyond two-level atomic models and includes modified contributions of spontaneous and stimulated emission as well as many-body effects. An extended version, which incorporates carrier-photon correlations, provides direct access to the photon autocorrelation function and thereby to the statistical properties of the laser emission. In comparison to atomic models, we find deviations in the dependence of the input/output curve on the spontaneous emission coupling factor. Our theory is presented together with measurements of first- and second-order coherence of quantum-dot micropillar lasers, obtained in the group of P. Michler.