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BEGIN:VEVENT
UID:0-775@lptms.universite-paris-saclay.fr
DTSTART:20210906T140000Z
DTEND:20210906T140000Z
DTSTAMP:20210726T073031Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/soutenance-de-the
 se-alexandre-pricoupenko/
SUMMARY:Soutenance de thèse : Alexandre Pricoupenko - Grand amphi\, bâtim
 ent Pascal n° 530 - 6 Sep 21 14:00
DESCRIPTION:Beyond-mean-field effects in ultracold gases\npar\n\nAlexandre 
 Pricoupenko\nUltracold gases are well controllable quantum systems that ar
 e described by a set of few parameters. The idea to look at systems with p
 artially attractive and repulsive forces\, fine-tuned to an approximate ov
 erall cancellation of the mean-field term\, provide an interesting platfor
 m for studying various beyond-mean-field phenomena\, remarkable recent exa
 mples being quantum droplets and dipolar supersolids. In this thesis\, we 
 take a step towards understanding the phase diagram of the 1D Bose-Bose mi
 xture with attractive interspecies and repulsive intraspecies contact inte
 ractions. We address the one-dimensional three-body problem with two- and 
 three-body interactions that we solve analytically. Then\, we develop the 
 perturbation theory for systems with a weak two-body potential interaction
 \, where the attractive and repulsive parts compensate each other. We calc
 ulate in every dimension the leading nonpairwise contribution\, which repr
 esents an effective three-body interaction. We apply this result particula
 rly to tilted dipoles in quasi-low-dimensional geometries. Interestingly\,
  we show the consistency of this few-body perturbative approach with the B
 ogoliubov one.\n&nbsp\;\n\nJury :\n\nFrédéric Chevy\, LKB ENS\, Paris\, 
 examinateur\n\nMario Gattobigio\, INPHYNI\, Nice\, rapporteur\n\nDenis Lac
 roix\, IJCLab\, Orsay\, examinateur\n\nDmitry Petrov\, LPTMS\, Orsay\, dir
 ecteur de thèse\n\nLuis Santos\, Leibniz Universität Hannover\, rapporte
 ur\n\nLeticia Tarruel\, ICFO\, Barcelona\, examinatrice
CATEGORIES:seminars
LOCATION:Grand amphi\, bâtiment Pascal n° 530\, rue André Rivière\, Ors
 ay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Rivière\, Orsay
 \, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Grand amphi\, bâtiment Pasca
 l n° 530:geo:0,0
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