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UID:1-38@lptms.universite-paris-saclay.fr
DTSTART:20120515T110000Z
DTEND:20120515T110000Z
DTSTAMP:20130201T114739Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-m-richard/
SUMMARY:Séminaire du LPTMS: Maxime Richard  - LPTMS\, salle 201\, 2ème é
 tage\, Bât 100\, Campus d'Orsay - 15 Mai 12 11:00
DESCRIPTION:One dimensional polariton condensate in semiconductor microstru
 cture\nMaxime Richard\, Institut Néel\nIn semiconductor nanostructures li
 ke microcavities\, when the so-called exciton-photon strong coupling regim
 e is reached\, the proper eigenstates of the system are mixed exciton-phot
 on states called exciton-polaritons. This last decade\, 2-dimensional micr
 ocavity exciton-polaritons in the quantum degenerate regime have shown fas
 cinating properties e.g. polariton lasing\, Bose-Einstein condensation and
  superfluidity [1]. Recently\, new systems and new geometries are being de
 veloped in order to study the polariton physics of dimensionality D\nRecen
 tly\, new systems in the strong coupling regime like ZnO microwires have b
 een introduced [4]. We show that polaritons in these systems have unusual 
 characteristics: they have only one spatial degree of freedom and they exh
 ibit low thermal decoherence thanks to a large Rabi splitting. Furthermore
 \, they are robust at large density and high temperature owing to the larg
 e exciton binding energy of ZnO. Striking differences exist also in the co
 ndensate phase. At cryogenic temperature and under strong pulsed optical e
 xcitation\, a transient polariton condensate is formed by stimulated relax
 ation into a state with a 97% excitonic fraction\, i.e. with a mass 15 tim
 es heavier than for polaritons usually encountered in planar microcavities
 . This feature is enabled by the combination of a large Rabi splitting (30
 0 meV) and a very small inhomogeneous broadening of excitons (~1 meV).\n[1
 ] L.S. Dang et al. Phys. Rev. Lett. 81 3920 (1998) \; J. Kasprzak et al.\,
  Nature 443\, 409 (2006) \; A. Amo et al.\, Nat. Phys. 5\, 805 (2009). [2]
  E. Wertz et al.\, Nat. Phys. 6\, 840-864 (2010). [3] G. Christmann et al.
  Appl. Phys. Lett. 93\, 051102 (2008). [4] L. Sun et al\, Phys. Rev. Lette
 rs 100\, 156403 (2008)\; A. Trichet et al.\, Phys. Rev. B 83\, 041302R (20
 11)
CATEGORIES:seminars
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
GEO:48.698185;2.181768
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\,
  Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è
 me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768
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