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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-282@lptms.universite-paris-saclay.fr
DTSTART:20140923T111500Z
DTEND:20140923T121500Z
DTSTAMP:20141203T132428Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-peter-schlagheck/
SUMMARY:Séminaire du LPTMS: Peter Schlagheck - LPTMS\, salle 201\, 2ème 
 étage\, Bât 100\, Campus d'Orsay - 23 Sep 14 11:15
DESCRIPTION:Coherent backscattering in the Fock space of a disordered Bose-
 Hubbard system\nPeter Schlagheck\, Université de Liège\nCoherent backsca
 ttering in disordered or chaotic systems is an ubiquitous wave phenomenon 
 that arises in a number of physical contexts involving classical (e.g. ele
 ctromagnetic) or quantum (matter) waves. It essentially refers to the cohe
 rent enhancement of the backscattering intensity in the direction that is 
 opposite to the propagation of the incident wave. From a semiclassical poi
 nt of view\, this enhancement is caused by the constructive interference o
 f backscattered classical paths with their time-reversed counterparts.\nIn
  my talk I shall discuss the generalization of this wave interference phen
 omenon to the many-body dynamics that takes place within an interacting Bo
 se-Hubbard system. In this particular context\, the "classical" paths are 
 given by solutions of a discrete nonlinear Gross-Pitaevskii equation and t
 heir "quantum" interference arises within the Fock space of the Bose-Hubba
 rd system. As a consequence\, an initially prepared Fock state is\, in the
  course of time evolution (and after averaging over random on-site energie
 s)\, twice as often encountered as other Fock states of the system with co
 mparable total energy. This semiclassical prediction represents a signific
 ant departure from the principle of quantum ergodicity in finite systems a
 nd is indeed confirmed by numerical simulations. We argue that an experime
 ntal detection of many-body coherent backscattering using ultracold bosoni
 c atoms in optical lattices is within reach.\nRef.: T. Engl\, J. Dujardin\
 , A. Argüelles\, P. Schlagheck\, K. Richter\, and J. D. Urbina\, Phys. Re
 v. Lett. 112\, 140403 (2014)
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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