Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 48: Quantum Dots and Wires: Microcavities
HL 48.6: Vortrag
Mittwoch, 9. März 2016, 11:30–11:45, H15
cQED effects in resonantly excited quantum dot-micropillar cavities — •Caspar Hopfmann1, Alexander Carmele2, Anna Musiał1,3, Micha Strauß4, Christian Schneider4, Sven Höfling4,5, Martin Kamp4, Andreas Knorr2, and Stephan Reitzenstein1 — 1Institute of Solid State Physics, Technische Universität Berlin, Germany — 2Institute of Theoretical Physics, Technische Universität Berlin, Germany — 3Faculty of Fundamental Problems of Technology, Wrocław University of Technology, Poland — 4Technische Physik, Universität Würzburg, Germany — 5School of Physics and Astronomy, University of St. Andrews, UK
Resonant excitation of quantum systems offers the unprecedented possibility of coherent control important for both fundamental study and applications due to minimized dephasing and direct addressing of a chosen state, enabling observation of phenomena not accessible otherwise. We employed resonance fluorescence (RF) to study cavity quantum electrodynamics effects in strongly coupled quantum dot (QD) - micropillar system. An advanced 90 degree excitation/detection scheme as well as spatial filtering is employed to extract the signal. For large detunings between the exciton (X) and the cavity mode (CM) both direct RF and a cavity-mediated signal is monitored and provides direct insight into the X-CM coupling. Varying the excitation power on resonance enabled observation of co-existence of a strongly coupled X-CM system and a laser-driven uncoupled QD transition, this is supported by theory based on Fourier-transformed first-order autocorrelation functions including multi-photon scattering.