Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 97: Quantum dots and wires: Pillars and cavities

HL 97.5: Talk

Friday, March 20, 2015, 10:30–10:45, ER 164

Statistical study on strong coupling of single and multiple quantum dots in micropillar cavities — •Anna Musial^1,2, Caspar Hopfmann¹, Micha Strauß³, Christian Schneider³, Sven Höfling^3,4, Martin Kamp³, and Stephan Reitzenstein¹ — ¹Institute of Solid State Physics, Berlin University of Technology, 10623 Berlin, Germany — ²Laboratory for Optical Spectroscopy of Nanostructures Department of Experimental Physics, Wrocław University of Technology, 50-370 Wrocław, Poland — ³Technische Physik, University of Würzburg, 97074 Würzburg, Germany — ⁴Present address: SUPA, School of Physics, and Astronomy, University of St Andrews, United Kingdom

Coherent photonic coupling of multiple quantum dots (QDs) in micropillar cavities is a very promising platform for the realization of coherent interaction between distant qubits. We performed a statistical study on various cases of strong coupling (SC) from isolated QDs coupled to cavity mode (CM) to multiple QDs interacting coherently via the CM. Experimental results are supported by the results of calculations in the framework of a coupled oscillator model. A characteristic triple peak spectral feature, increased effective coupling constant and double anticrossing, beeing a fingerprint of coherent coupling between 3 quantum states (hybrid states of two excitons and a CM), have been observed at resonance in agreement with the Tavis-Cummings description. Moreover, the hybridization of the coupled states is also reflected in a characteristic change of their polarization properties.