%0 Conference Paper
%F Oral 
%T Condensation of polaritons up to 300K and in-plane propagation in a ZnO microcavity
%+ Laboratoire Charles Coulomb (L2C)
%+ Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA)
%+ Laboratoire des sciences et matériaux pour l'électronique et d'automatique (LASMEA)
%+ Laboratoire de photonique et de nanostructures (LPN)
%A Guillet, Thierry
%A Li, Feng
%A Orosz, Laurent
%A Kamoun, Olfa
%A Bouchoule, Sophie
%A Brimont, Christelle
%A Disseix, Pierre
%A Lafosse, Xavier
%A Leroux, Mathieu
%A Leymarie, Joël
%A Malpuech, Guillaume
%A Mexis, Meletios
%A Mihailovic, Martine
%A Patriarche, Gilles
%A Réveret, François
%A Solnyshkov, Dimitri
%A Zúñiga-Pérez, Jesús
%< avec comité de lecture
%Z PEPS
%B 13th international conference on Optics of Excitons in Confined Systems (OECS13)
%C Rome, Italy
%8 2013-09-09
%D 2013
%Z Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]Conference papers
%X ZnO is a wide bandgap semiconductor with strong excitonic properties, in particular a large oscillator strength and a large exciton binding energy. It therefore raises a strong interest for the generation and control of polariton condensates up to room temperature. We have recently reported the condensation of polaritons in a bulk ZnO microcavity over an unprecedented range of exciton-photon compositions and of temperatures, up to room temperature [1]. The complete phase diagram of the ZnO polariton laser has been measured (cf figure 1a), showing that its threshold is only 6 times larger at 300 K than at 8 K. It is in a good qualitative agreement with the simulations of exciton and polariton relaxation in a kinetic model (figure 1b). Strongly excitonic (96% exciton fraction) as well as strongly photonic condensates (83% photon fraction) are realized (figure 1c). Moreover imaging of the condensate allows to evidence in-plane free propagation of the polariton condensate starting from the excitation spot. This tunability is obtained on a fully-hybrid microcavity with a high quality factor (Q>2000) and a large Rabi splitting (250 meV); it represents an important progress compared to our previous demonstration of a ZnO polariton laser in a Q=450 microcavity [2], as well as to other recent reports [3]. It also confers a strong advantage to ZnO microcavities compared to GaN [4], since strong excitonic condensates can here be investigated. Figure 1. (a) Detuning dependence of the polariton condensation threshold for a 2.5 polariton branch, under quasi-continuous excitation; (b) Polariton density at the condensation threshold deduced from the kinetic model; (c) Angle-resolved emission below and above threshold (T=300K, almost zero detuning). The authors acknowledge financial support from FP7 program through ITN networks CLERMONT4 (235114) and SPIN-OPTRONICS (237252). References [1] F. Li et al., Phys. Rev. Lett. 110, 196406 (2013) [2] T. Guillet et al., Appl. Phys. Lett. 98, 211105 (2011) [3] H. Franke et al., New J. Phys. 14, 013037 (2012); T.C. Lu et al., Optics Express 20, 5530 (2012) [4] J. Levrat et al., Phys. Rev. B 81, 125305 (2010)
%G English
%L hal-00924372
%U https://hal.science/hal-00924372
%~ UNICE
%~ PRES_CLERMONT
%~ CNRS
%~ UNIV-BPCLERMONT
%~ OPENAIRE
%~ L2C
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UNIV-COTEDAZUR
%~ CRHEA
%~ UM-2015-2021