Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 48: Quantum Dots and Wires: Microcavities

HL 48.5: Hauptvortrag

Mittwoch, 9. März 2016, 11:00–11:30, H15

Exciton-polariton thermodynamics in ZnSe-based microcavities — •Sebastian Klembt^1,5, Emilien Durupt¹, Sanjoy Datta², Thorsten Klein³, Yoan Léger⁴, Augustin Baas¹, Charsten Kruse³, Detlef Hommel³, Anna Minguzzi², and Maxime Richard¹ — ¹Institut Néel, CNRS-CEA-Université Grenoble Alpes, France — ²LPMMC, CNRS-Université Grenoble Alpes, France — ³IFP, Universität Bremen, Germany — ⁴CNRS, FOTON, Insa de Rennes, France — ⁵Technische Physik, Universität Würzburg, Germany

Exciton-polaritons have attracted considerable interest since they allowed for fundamental understandings of light-matter interactions such as polariton Bose-Einstein condensation and superfluidity. At high density, polaritons constitute indeed a driven dissipative quantum fluid of half-light, half-matter integer spin quasi-particles, which is embedded in a solid-state crystalline environment. The thermodynamic properties of polariton fluids have been mostly overlooked so far. An intriguing specificity of polariton condensates is their contact with three different reservoirs: the thermal phonon bath, the exciton bath and the electromagnetic vacuum. We show experimentally and theoretically that phonons can be efficiently absorbed by inelastic scattering with polaritons. A Raman spectroscopy based technique is presented using anti-Stokes fluorescence (ASF) and we show that under suitable conditions a net cooling rate can be generated by polariton ASF. By using high-Q ZnSe-microcavities the interaction between polariton condensates at up to T=270 K with the respective phonon baths is also investigated.