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UID:0-975@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20240927T134500
DTEND;TZID=Europe/Paris:20240927T151500
DTSTAMP:20240919T122211Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/informal-quantum-
 seminar-lorenzo-gotta-geneva-university/
SUMMARY:Informal Quantum Seminar: Lorenzo Gotta (Geneva University) - Salle
  des séminaires du FAST et du LPTMS\, bâtiment Pascal n°530 - 27 Sep 24
  13:45
DESCRIPTION:Dirac impurity in a Luttinger liquid\nLorenzo Gotta (University
  of Geneva)\n&nbsp\;\n\nWe consider a linearly-dispersing quantum impurity
  interacting through a contact density-density term with a one-dimensional
  superfluid described by Luttinger liquid theory. We employ field-theoreti
 cal tools to characterize the impurity dynamics by calculating approximate
  expressions for the single-particle Green's function and the time evoluti
 on of the density profile. We discover the existence of two different dyna
 mical regimes\, separated by a change in the relative magnitude of the imp
 urity velocity and of the sound velocity. When the latter is smaller than 
 the former\, the impurity behavior is dominated by the quasiparticle unive
 rsality class\, signaled by the existence of a well-defined lifetime. In t
 he opposite case\, the dynamical properties of the mobile impurity are ins
 tead interpreted as a manifestation of Anderson's orthogonality catastroph
 e\, and result in an enhanced robustness of free impurity propagation with
  respect to the quasiparticle regime. Preliminary results on the effects o
 f a finite-temperature bath on the impurity probes are additionally presen
 ted.
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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