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BEGIN:VEVENT
UID:0-646@lptms.universite-paris-saclay.fr
DTSTART:20190205T143000Z
DTEND:20190205T173000Z
DTSTAMP:20190124T073511Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/soutenance-de-the
 se-de-giulio-bertoli/
SUMMARY:Soutenance de thèse: Giulio Bertoli - IPN-batiment 100\, Auditoriu
 rm - 5 Fév 19 14:30
DESCRIPTION:Soutenance de thèse:\nMany-body localization of two-dimensiona
 l disordered bosons\npar\n\nGiulio Bertoli\nJury:\n\n 	Rapporteur : Anna M
 inguzzi (LPMMC\, Grenoble)\n 	Rapporteur : Vladimir Yudson (Russian Quantu
 m Center\, Moscow)\n 	Examinateur : Vladimir Kravtsov (ICTP\, Trieste)\n 	
 Examinateur : Nicolas Pavloff (LPTMS\, Orsay)\n 	Directeur de thèse : Geo
 rgy Shlyapnikov (LPTMS\, Orsay)\n\nRésumé:\nThe study of the interplay b
 etween localization and interactions in disordered quantum systems led to 
 the discovery of the interesting physics of many-body localization (MBL). 
 This remarkable phenomenon provides a generic mechanism for the breaking o
 f ergodicity in quantum isolated systems\, and has stimulated several ques
 tions such as the possibility of a finite-temperature fluid-insulator tran
 sition. At the same time\, the domain of ultracold interacting atoms is a 
 rapidly growing field in the physics of disordered quantum systems.\nIn th
 is Thesis\, we study many-body localization in the context of two-dimensio
 nal disordered ultracold bosons. After reviewing some importance concepts\
 , we present a study of the phase diagram of a two-dimensional weakly inte
 racting Bose gas in a random potential at finite temperatures. The system 
 undergoes two finite-temperature transitions: the MBL transition from norm
 al fluid to insulator and the Berezinskii-Kosterlitz-Thouless transition f
 rom algebraic superfluid to normal fluid. At T=0\, we show the existence o
 f a tricritical point where the three phases coexist. We also discuss the 
 influence of the truncation of the energy distribution function at the tra
 p barrier\, a generic phenomenon for ultracold atoms. The truncation limit
 s the growth of the localization length with energy and\, in contrast to t
 he thermodynamic limit\, the insulator phase is present at any temperature
 . Finally\, we conclude by discussing the stability of the insulating phas
 e with respect to highly energetic particles in systems defined on a conti
 nuum.
CATEGORIES:seminars
LOCATION:IPN-batiment 100\, Auditoriurm\, 15 Rue Georges Clemenceau\, orsay
 \, France
GEO:48.698196;2.181773
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\,
  orsay\, France;X-APPLE-RADIUS=100;X-TITLE=IPN-batiment 100\, Auditoriurm:
 geo:48.698196,2.181773
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