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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-403@lptms.universite-paris-saclay.fr
DTSTART:20160202T110000Z
DTEND:20160202T121500Z
DTSTAMP:20160122T150852Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-jean-marie-stephan-2/
SUMMARY:Séminaire du LPTMS: Jean-Marie Stephan - LPTMS\, salle 201\, 2ème
  étage\, Bât 100\, Campus d'Orsay - 2 Fév 16 11:00
DESCRIPTION:\n\nFilling fraction quantum quenches and the arctic circle\n\n
 Jean-Marie Stephan (PKS-MPG Dresden)\n\nI consider a simple non-equilibriu
 m problem\, where a critical one-dimensional system is prepared in a state
  with two different densities on the left and on the right\, and let evolv
 e with a Hamiltonian that conserves the number of particles. A typical exa
 mple would be a fermionic system prepared with different left/right chemic
 al potentials. For free systems a lot can\, and has been understood by mak
 ing use of a semiclassical picture\, in which particles carrying a momentu
 m k propagate ballistically with velocity v(k). Generalization to interact
 ing systems is very much an open problem. I will discuss attempts at under
 standing such dynamics using field theory. A possible strategy is to study
  the behavior in imaginary time\, the real time dynamics being recovered b
 y performing the Wick rotation. I will show that all degrees of freedom ou
 tside a certain region may freeze in imaginary time\, contrary to naive ex
 pectations. This behavior is analogous to the celebrated "arctic circle" p
 henomenon found in the study of two-dimensional classical dimer or vertex 
 models. I will also show that the fluctuating region is described by a mas
 sless field theory with a position-dependent metric\, a field theory in cu
 rved space. Such imaginary time pictures can be used to make predictions a
 bout the behavior of correlation functions\, entanglement entropies\, or r
 eturn probabilities after the quench.\n\n
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
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  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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