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HL: Fachverband Halbleiterphysik
HL 25: Quantum dots: Microcavities and microlaser
HL 25.5: Vortrag
Dienstag, 17. März 2015, 10:30–10:45, EW 203
Unconventional Collective Normal-Mode Coupling in Quantum-Dot-based Bimodal Micro-Lasers — •A. Foerster1, M. Khanbekyan2, H.A.M. Leymann1, C. Hopfmann2, C. Schneider3, S. Höfling4, M. Kamp3, J. Wiersig1, and S. Reitzenstein2 — 1Institut für Theoretische Physik, Universität Magdeburg, Germany — 2Institut für Festkörperphysik, Technische Universität Berlin, Germany — 3Technische Physik, Universität Würzburg, Germany — 4School of Physics and Astronomy, University of St Andrews, United Kingdom
Collective coupling of multiple emitters and the normal-mode splitting proportional to a generalized coupling strength has been observed in many experiments. We analyze the occurrence of a rather unconventional normal-mode coupling in bimodal micro-lasers. The effect is attributed to the collective interaction of the cavity field with a mesoscopic number of semiconductor quantum dots as the active medium. In contrast to the conventional normal-mode coupling appearing in various schemes in the context of the single-particle or collective strong coupling regime, here we observe a hybridization of the cavity modes that leads to a locking of the frequencies and to a splitting of the linewidths in the coherent regime. Vice versa in the incoherent regime splitting of the frequencies and locking of the linewidths is observed. Our investigations are based on microscopic calculations for a bimodal quantum-dot-laser[1] and experiments that confirm the predictions in the incoherent regime.
[1] H.A.M. Leymann, et al. Phys. Rev. A 87, 053819 (2013)