Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: Symposium Bose-Einstein Kondensation in Halbleitern

HL 20.1: Hauptvortrag

Dienstag, 27. März 2007, 10:45–11:15, H15

Polariton Condensation in CdTe Microcavities: interaction and coherence — J. Kasprzak¹, M. Richard², S. Kundermann², A. Baas², P. Jeambrun², J. Keeling³, F. M. Marchetti⁴, M. H. Szymanska⁵, R. André¹, J. L. Staehli², P. B. Littlewood⁴, B. Deveaud², and •Daniel Le Si Dang¹ — ¹Laboratoire de Spectrométrie Physique, CNRS-Université J. Fourier-Grenoble, France — ²Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland — ³M.I.T., Cambridge (Ma.), USA — ⁴Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom — ⁵Clarendon Laboratory, University of Oxford, Oxford, United Kingdom

Polaritons in semiconductor microcavities are quasi-particles which result from the strong coupling between confined photons and electronic excitations. These bosons are 10⁹ times lighter than rubidium atoms, thus permitting BEC to occur at low density and high temperature. In this talk we present evidence for polariton condensation at around 20 K in a CdTe microcavity [Bose-Einstein condensation of exciton polaritons, Kasprzak et al., Nature 443, 409 (2006)]. We show also how the spontaneous coherence of the polariton condensate differs from the ideal case of non interacting bosons. We gratefully acknowledge support from the EU Network HPRN-CT-2002-00298 "Photon-mediated phenomena in semiconductor nanostructures".