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BEGIN:VEVENT
UID:0-653@lptms.universite-paris-saclay.fr
DTSTART:20190219T110000Z
DTEND:20190219T120000Z
DTSTAMP:20190215T115835Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-isabelle-bouchoule/
SUMMARY:Séminaire du LPTMS: Isabelle Bouchoule - LPTMS\, salle 201\, 2ème
  étage\, Bât 100\, Campus d'Orsay - 19 Fév 19 11:00
DESCRIPTION:Generalised hydrodynamics on an atom chip\nIsabelle Bouchoule (
 Institut d'Optique)\nDescribing the out-of-equilibrium dynamics of many-bo
 dy quantum systems is a priori a tremendously difficult task. However\, a 
 recent theoretical development provides an ab-initio description of the lo
 ng wavelength dynamics of 1D integrable quantum systems\, the so-called Ge
 neralised Hydrodynamics (GHD). In contrast to conventional hydrodynamics\,
  GHD does not assume that gas is locally described by the Gibbs ensemble b
 ut it keeps track of all conserved quantities of the integrable system. In
  cold atom experiments\, 1D bosonic gases are realised\, which are well de
 scribed by the famous integrable Lieb-Liniger model. Cold atom experiments
  thus offer an ideal platform to test GHD.\n\nWe use the atom-chip experim
 ent of LCF\, where 1D gases of 87Rb are realized\, to test experimentally 
 GHD. Starting from a cold atomic cloud at thermal equilibrium\, dynamics i
 s generated by a sudden quench of the longitudinal potential. The measured
  time evolution of the density profiles are in excellent agreement with pr
 edictions from GHD. We also compare our data with predictions from the con
 ventional hydrodynamics method\, which assumes locally a thermal equilibri
 um described by a Gibbs ensemble. Except for the special case of harmonic 
 potentials\, we find that conventional hydrodynamics completely fails to r
 eproduce our data. Hydrodynamics even predicts the development of sharp st
 ructures leading to a chock phenomena\, such a phenomena being absent in t
 he data and in the GHD description.\n\n&nbsp\;
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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