Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 42: Optical Properties of Quantum dots: Theory and Simulation
HL 42.11: Vortrag
Donnerstag, 28. Februar 2008, 12:30–12:45, EW 201
Coherence properties, photon statistics, and mode properties of quantum-dot based microcavity lasers — •Jan Wiersig1, Christopher Gies1, Michael Lorke1, Frank Jahnke1, and Martina Hentschel2 — 1Institut für Theoretische Physik, Universität Bremen, 28334 Bremen — 2Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden
Semiconductor quantum dots as active material offer several advantages for laser applications. In combination with optical microcavities these systems promise ultra-low thresholds and genuine single-mode lasing [1,2]. This talk reviews our recent progress in developing a microscopic theory for the photon correlation functions g(1)(τ) and g(2)(τ) describing the first-order coherence and the photon statistics of quantum-dot-based microcavity lasers. In the transition region from spontaneous to dominantly stimulated emission our theory predicts a qualitative change of g(1)(τ) from a Gaussian-like to an exponential behaviour in agreement with recent experiments. Moreover, we demonstrate two different approaches to achieve unidirectional laser light emission from deformed microdisk cavities. One scheme is based on avoided resonance crossings [3], the other one on chaotic ray dynamics.
[1] S.M. Ulrich, C. Gies et al., Phys. Rev. Lett. 98, 043906 (2007).
[2] C. Gies, J. Wiersig, M. Lorke, and F. Jahnke, Phys. Rev. A 75, 013803 (2007).
[3] J. Wiersig and M. Hentschel, Phys. Rev. A 73, 031802(R) (2006).