Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 82: Quantum dots and wires: Cavities and photons
HL 82.9: Vortrag
Donnerstag, 14. März 2013, 17:15–17:30, H2
Gain competition enhanced intensity fluctuations in bimodal quantum dot – micropillar lasers — •Heinrich A. M. Leymann, Mikayel Khanbekyan, Alexander Foerster, and Jan Wiersig — Institut für Theoretische Physik, Universität Magdeburg, Postfach 4120, D-39016 Magdeburg, Germany
In the last decade intense research on the physics of microcavity lasers based on semiconductor quantum dots has been performed due to their high potential for ultralow threshold lasing [1]. For lasers with a spontaneous emission factor close to unity the onset of lasing can be more reliably monitored by means of the photon statistics.
In this contribution, we present a theoretical study of a quantum-dot-based microcavity laser where two nearly degenerate high-Q modes are involved in the laser dynamics. To analyze the coupled carrier-photon system we have extended a single mode microscopic semiconductor theory [2] to the case of two modes and have also taken the crosscorrelation functions into account.
Our theoretical results show that the mode which loses the mode competition exhibit super-thermal photon bunching (g(2)(0)>2). This interesting feature is traced back to mode coupling induced by the gain medium. Calculations of the photon cross-correlations reveal that the two modes are strongly entangled.
[1] J. Wiersig et al., Nature 460, 245 (2009).
[2] C. Gies et al., Phys. Rev. A 75, 013803 (2007).