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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-387@lptms.universite-paris-saclay.fr
DTSTART:20151117T110000Z
DTEND:20151117T120000Z
DTSTAMP:20151029T115614Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-pierre-elie-larre/
SUMMARY:Séminaire du LPTMS: Pierre-Elie Larré - LPTMS\, salle 201\, 2ème
  étage\, Bât 100\, Campus d'Orsay - 17 Nov 15 11:00
DESCRIPTION:Superfluid and quantum features in the hydrodynamic flow of a f
 luid of light\nPierre-Élie Larré\, INO-CNR BEC Center\, Dipartimento di 
 Fisica\, Università di Trento\, Via Sommarive 14\, 38123 Povo\, Italia\nI
 n the presence of a significant Kerr optical nonlinearity\, a many-photon 
 light beam can behave as a quantum fluid of interacting bosons. This has o
 pened the way to active experimental and theoretical investigations of man
 y-body hydrodynamic and quantum features in photon-based systems\, the res
 earch field of the so-called quantum fluids of light. A promising platform
  to study photon-fluid physics consists in the paraxial propagation of a q
 uasimonochromatic light wave through a nonabsorbing cavityless nonlinear o
 ptical medium of Kerr type. In contrast to semiconductor-planar-microcavit
 y architectures where driving and dissipation play a major role in the evo
 lution of the fluid of light\, the photon field in a cavityless\, propagat
 ing\, geometry obeys a fully conservative Gross–Pitaevskii-type quantum 
 dynamics. The statistical properties of the photon beam entering the diele
 ctric fix the initial conditions of the problem and the ones of the light 
 exiting the medium determine the final state of the photon field.\nThe fir
 st part of my talk will be dedicated to a review of a very general quantum
  theory of light propagation in such a configuration. As a first applicati
 on of the formalism\, we will see in a second part that the occurrence of 
 a frictionless flow of superfluid light past a solid dielectric immersed i
 nto a nonlinear optical liquid may be revealed from the dramatic suppressi
 on of the optomechanical deformation of the object\, demonstrating that\, 
 in the optical case also\, superfluidity is associated with a drop in the 
 force exerted by the fluid on obstacles stymying its flow. In a third part
 \, I will show that the paraxial-propagation geometry constitutes a very s
 imple platform to investigate quantum-quench physics in closed systems of 
 many interacting bosons\, including\, e.g.\, the acoustic analog of the dy
 namical Casimir effect\, the light-cone-like spreading of the two-body cor
 relations following a quantum quench\, or the emergence of prethermalizati
 on features in one-dimensional configurations. Before concluding\, I will 
 present ongoing experiments aiming at measuring the Bogoliubov dispersion 
 relation in a one-dimensional nonlinear optical waveguide (in Trento) and 
 at detecting superfluid features in the flow of a photon fluid past a loca
 lized optical defect (in Nice and Edinburgh). Finally\, I  will briefly e
 xpose in-progress works carried out in Trento and Trieste\, on the study o
 f the strong-interaction\, Tonks–Girardeau\, regime in one-dimensional c
 avityless geometries and on the investigation of the relaxation of a quant
 um-quenched photon gas towards the Bose–Einstein statistics.
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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