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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-533@lptms.universite-paris-saclay.fr
DTSTART:20171003T110000Z
DTEND:20171003T120000Z
DTSTAMP:20170927T102728Z
URL:https://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lpt
 ms-davide-squizzato/
SUMMARY:Séminaire du LPTMS: Davide Squizzato - LPTMS\, salle 201\, 2ème 
 étage\, Bât 100\, Campus d'Orsay - 3 Oct 17 11:00
DESCRIPTION:\nKPZ Physics in Exciton Polaritons Systems\n\nDavide Squizzato
  (LPMMC\, Grenoble)\nThe experimental demonstration of Bose-Einstein conde
 nsation of exciton polaritons gases in driven-dissipative conditions [1] h
 as given rise to several questions on the nature and the characterization 
 of out-of-equilibrium bosonic systems under pump and dissipation. Such sys
 tems can be theoretically described by a generalised Gross-Pitaevskii equa
 tion (gGPE) in which complex coefficients and noise enrich the equilibrium
  picture. An analytical mapping between gGPE and the Kardar-Parisi-Zhang (
 KPZ) equation has been demonstrated at long wavelength if fluctuations of 
 the amplitude of the condensate are negligible with respect to the ones of
  the phase field. Hence\, one expects the long-distance properties of driv
 en-dissipative condensates to pertain to the KPZ universality class. A num
 erical verification of KPZ scaling was given in (1+1)dimensions [2]\; howe
 ver\, the experimental accessibility of the KPZ mapping is still under deb
 ate. In this work we use both Keldysh field-theoretical approach and numer
 ical simulations to investigate the effects of inhomogeneities typical of 
 experimental set-ups and study their effects on the universal properties o
 f driven-dissipative polaritons condensates\; we furthermore look at the r
 eal-time statistics of the phase in both homogeneous and in-homogeneous ca
 se in order to better understand the nature of KPZ behaviour\, i.e. the ge
 ometrical sub-class to which it belongs to.\n\nReferences:\n\n	[1] J. Kasp
 rzak et al.\, “Bose-Einstein condensation of exciton polaritons”\, Nat
 ure 443\, pp. 409–414\, Sep 2006.\n	[2] L. He\, L. M. Sieberer\, E. Altm
 an\, and S. Diehl\, “Scaling properties of one-dimensional driven-dissip
 ative condensates”\, Phys. Rev. B 92\, 155307\, Oct 2015.\n
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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