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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-492@lptms.universite-paris-saclay.fr
DTSTART:20170126T140000Z
DTEND:20170126T150000Z
DTSTAMP:20170117T170732Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-olexander-gamayun-seminaire-exceptionnel/
SUMMARY:Séminaire du LPTMS: Oleksandr Gamayun  *** séminaire exceptionnel
  *** - LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay - 26 J
 an 17 14:00
DESCRIPTION:Quantum dynamics of a mobile impurity in a one-dimensional Ferm
 i gas\nOleksandr Gamayun (Leiden Unversity\, The Netherlands)\nA single im
 purity particle in an ultracold atomic gas is a prospective model for prob
 ing relaxation dynamics of an interacting out-of-equilibrium quantum syste
 m. I will focus on a case of an impurity that propagates in a one-dimensio
 nal gas of free fermions and interacts with them through the contact inter
 action. It is the simplest and yet fundamental model capturing a peculiar 
 physics and mathematics of the non-equilibrium processes. A particular fea
 ture of this model is integrable when masses of the impurity and gas parti
 cles are equal. In this case\, I will present a full nonpertubative soluti
 on and express physical quantities in terms of the Fredholm determinants o
 f integrable integral operators. After a detailed analysis of the mathemat
 ical structure of the Fredholm determinants\, I will discuss several strik
 ing physical phenomena such as incomplete relaxation\, Bloch oscillations\
 , and momentum-dependent impurity statistics. To describe the non-integrab
 le case\, I will develop a kinetic theory approach. I will then present it
 s modification that allows description of the integrable case as well. Fin
 ally\, I will give some arguments about the persistence of the discussed p
 henomena at a finite temperature.\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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