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HL: Fachverband Halbleiterphysik
HL 16: Microcavities
HL 16.2: Vortrag
Montag, 14. März 2011, 14:45–15:00, FOE Anorg
Emission characteristics of a highly correlated system of a quantum dot coupled to two distinct micropillar cavity modes — •Stefanie Weiler1, Ata Ulhaq1, Sven Marcus Ulrich1, Stephan Reitzenstein2, Andreas Löffler2, Alfred Forchel2, and Peter Michler1 — 1Universität Stuttgart, Allmandring 3, 70569 Stuttgart — 2Universität Würzburg, Am Hubland, 97074 Würzburg
Quantum dots (QDs) are promising candidates for quantum information technology. Even though they are referred to as artificial atoms, the interaction of QDs with the surrounding solid state medium has to be considered to explain the recently discovered and yet not fully theoretically explained effect of nonresonant dot-cavity coupling. In our work [S. Weiler et al., PRB 82, 205326 (2010)] we have investigated the emission characteristics of a system of one QD coupled to two distinct modes of a surrounding micropillar cavity. We have verified the anti-correlation among the QD and the two modes via auto- and cross-correlation measurements, revealing a highly correlated system. Systematic lifetime and coherence time measurements (p-shell excitation) gave important insight in the emission dynamics and coherence of the system. QD and modes show the lifetime behavior expected by Purcell enhancement, when controllably varying the emitter-mode detuning. The mode emission coherence stays at a constant low level for all detunings. When exciting the QD resonantly, we could demonstrate nonresonant coupling to the nearby mode and with increasing power also to the far detuned fundamental mode of the system.