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UID:0-749@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20201006T110000
DTEND;TZID=Europe/Paris:20201006T120000
DTSTAMP:20201003T144223Z
URL:https://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lpt
 ms-lenart-zadnik-2/
SUMMARY:Séminaire du LPTMS : Lenart Zadnik - Grand amphi\, bâtiment Pasca
 l n° 530 - 6 Oct 20 11:00
DESCRIPTION:Large-anisotropy limit of Heisenberg antiferromagnet: Towards d
 escription of pre-relaxation phenomena\nLenart Zadnik (LPTMS)\n\nSeminar t
 aking place at Batiment Pascal with ZOOM streaming.\n\nZOOM Meeting ID: 95
 9 1349 7684\nPassword: 878617 \n\nThe recent decade has witnessed several 
 breakthroughs in the description of relaxation of local observables in qua
 ntum many-body systems prepared far from equilibrium. In contrast\, the ti
 me evolution on intermediate time scales that precede relaxation towards t
 he stationary state has remained much less explored. Strong coupling expan
 sions offer a good starting point for investigation of such problems\, sin
 ce they provide a natural time scale\, on which the pre-relaxation can occ
 ur. We will discuss the effective Hamiltonian that generates time evolutio
 n of states on intermediate time scales in the large-anisotropy limit of H
 eisenberg spin-1/2 chain. Such an effective Hamiltonian describes a simple
  Bethe-Ansatz-solvable model with local interactions. Starting from a micr
 oscopic picture of the dynamics\, I will explain the ballistic-scale hydro
 dynamic theory describing the time evolution after a quench\, in which two
  halves of the system\, thermalised at different temperatures\, are abrupt
 ly joined.
CATEGORIES:seminars
LOCATION:Grand amphi\, bâtiment Pascal n° 530\, rue André Rivière\, Ors
 ay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Rivière\, Orsay
 \, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Grand amphi\, bâtiment Pasca
 l n° 530:geo:0,0
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