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UID:0-1120@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20260702T100000
DTEND;TZID=Europe/Paris:20260702T100000
DTSTAMP:20260619T131319Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/soutenance-de-the
 se-alice-marche/
SUMMARY:Soutenance de thèse : Alice Marché - Grand amphi\, bâtiment Pasc
 al n° 530 - 2 Juil 26 10:00
DESCRIPTION:Long-time relaxation of open quantum many-body systems\nAlice M
 arché\n\nIn this thesis\, we investigate the relaxation of quantum many-b
 ody dissipative systems\, initially far from equilibrium. We focus on Mark
 ovian systems whose dynamics are governed by a Lindbladian and analyze how
  they approach their stationary states at long times. The results presente
 d in this work are twofold. Firstly\, we study systems governed by gapless
  Lindbladians\, which exhibit critical slowing down of their relaxation dy
 namics. We derive analytical predictions for this slow decay in two differ
 ent settings: two bosons undergoing local two-body losses\, either in the 
 continuum or on a one-dimensional lattice\, and a spin-1/2 chain with non-
 reciprocal hopping described by two-site correlated dissipation. Secondly\
 , we investigate how symmetries constrain the dynamics and stationary stat
 es of dissipative quantum systems\, allowing them to retain partial memory
  of their initial conditions. In particular\, we analyze a dephasing model
  that hosts\, together with the maximally mixed state\, an additional stat
 ionary state associated with a non-extensive strong symmetry\, displaying 
 a phenomenology similar to that of quantum many-body scars in closed syste
 ms. We also study an SU(3)- invariant Fermi–Hubbard gas subject to on-si
 te three-body losses. We show that this system exhibits a rich structure o
 f symmetry-protected dark states\, which can be characterized using semist
 andard Young tableaux. \n&nbsp\;\n\nJury : Jérôme Dubail (rapporteur)\,
  Hosho Katsura (invité)\, Zala Lenarčič (rapporteur)\, Leonardo Mazza (
 directeur de thèse)\, Grégoire Misguich\, Pierre Nataf.
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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TZID:Europe/Paris
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DTSTART:20260329T030000
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