Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 86: New Materials

HL 86.6: Talk

Friday, March 24, 2017, 10:45–11:00, POT 112

Transition from Jaynes-Cummings to Autler-Townes ladder in a quantum dot-microcavtity system — C. Hopfmann¹, A. Carmele², •A. Musiał^1,3, M. Strauß⁴, M. Kamp⁴, C. Schneider⁴, S. Höfling^4,5, A. Knorr², and S. Reitzenstein¹ — ¹IFP, TU Berlin, Germany — ²ITP, TU Berlin, Germany — ³LOSN, Politechnika Wrocławska, Poland — ⁴TEP, Universität Würzburg, Germany — ⁵SUPA, University of St Andrews, UK

We report on experimental and theoretical study of resonantly-driven quantum dot exciton (X) strongly coupled to the microcavity mode (CM). Investigated system exhibits dramatically different character depending on the excitation strength from vacuum Rabi doublet when coupled X-CM is weakly probed to Mollow triplet-like behavior under strong coherent pump. Focus is on the unexplored intermediate regime, where the laser field dresses the polaritons and the coupling of the X to the confined CM and to the laser are equally important, as proven by observing injection pulling of the polariton branches. This regime is of particular interest since it connects the purely quantum mechanical Jaynes-Cummings and the semi-classical Autler-Townes ladder. In order to address underlying physics we excite the coupled system via the matter component of fermionic nature undergoing saturation - in contrast to commonly used cavity-mediated excitation which determines the evolution of the system at high occupations. Exploring the driving strength-dependence we establish robust fingerprint of the transition to be the maximum in the resonance fluorescence signal [1].

[1] C. Hopfmann et al., arXiv:1609.03462 (2016).