Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 25: Quantum dots: Microcavities and microlaser

HL 25.3: Talk

Tuesday, March 17, 2015, 10:00–10:15, EW 203

CQED effects in resonantly excited quantum dot-micropillar cavities — •Caspar Hopfmann¹, Micha Strauß², Christian Schneider², Sven Höfling², Martin Kamp², and Stephan Reitzenstein³ — ¹Institute of Solid State Physics, Technische Universität Berlin, D-10623 Berlin, Germany — ²Technische Physik, Universität Würzburg, D-97074 Würzburg, Germany — ³present address: University of St Andrews, North Haugh, KY16 9SS UK

Resonance fluorescence of single quantum dots (QDs) as well as cavity quantum electrodynamics (cQED) in high quality QD-microcavities have been subject of extensive research interest in recent years. We employ resonance fluorescence to study cQED effects in high-quality QD-micropillar cavities. An advanced 90 degree excitation/detection scheme as well as spatial filtering is employed to separate excitation and signal. This study of cQED phenomena includes investigation of fundamental cavity effects in the coupled QD-micropillar system in both weak and strong coupling regime as well as their application in non-classical light sources. We investigate strict resonant excitation in the strong coupling regime. In this regime with enhanced light-matter-coupling strength the off-resonant QD-cavity coupling is very efficient and allows us to use the cavity mode emission as a convenient monitor in resonance fluorescence experiments on single QD under variation of the spectral detuning with the cavity mode. Moreover, using resonance fluorescence, dephasing of QD transitions is reduced, which in turn enables the investigation of effects such as higher ranks of the Jaynes-Cummings ladder not accessible in non-resonant excitation schemes.