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UID:0-1082@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20260123T140000
DTEND;TZID=Europe/Paris:20260123T153000
DTSTAMP:20260120T080002Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/informal-quantum-
 seminar-vincent-grison-lptmc-jussieu/
SUMMARY:Informal Quantum Seminar: Vincent Grison (LPTMC Jussieu) - Salle de
 s séminaires du FAST et du LPTMS\, bâtiment Pascal n°530 - 23 Jan 26 14
 :00
DESCRIPTION:From Bose glass to Many-Body Localization in a one-dimensional 
 disordered Bose gas\nVincent Grison (LPTMC Jussieu)\n&nbsp\;\nOne-dimensio
 nal interacting bosons subjected to disorder are known to possess an insul
 ating ground state\, called the Bose glass. At finite temperature\, pertur
 bative computations advocate for a crossover to a non-disordered normal fl
 uid\, but an alternative scenario was also suggested\, arguing for the exi
 stence of a genuine phase transition. The resulting low-temperature insula
 ting phase is then akin to the Many-Body Localized (MBL) phase\, first int
 roduced for fermions.\nTo settle this debate\, we develop a field-theoreti
 cal approach leveraging the Functional Renormalization Group (FRG). At zer
 o temperature\, we find a new non-perturbative fixed point\, the approach 
 to which contains information on the low-energy excitations of the system.
  We then turn to finite temperature effects\, discussing various crossover
 s to the normal fluid phase\, where disorder still plays an important role
  at finite length and time scales. Finally\, we point out how a modificati
 on of our approximations leads to a different scenario for the low-tempera
 ture physics of the system\, and put forward a hypothesis linking it to MB
 L.
CATEGORIES:seminars
LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53
 0\, rue André Riviere\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\
 , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST 
 et du LPTMS\, bâtiment Pascal n°530:geo:0,0
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