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SUMMARY:[Séminaire atomes froids] Nicolas Cherroret (LKB)
CREATED:20260105T094621Z
DTSTAMP:20260105T094621Z
URL:https://www.lptmc.jussieu.fr/vie-scientifique/listeseminaires/seminaire-atomes-froids-4
DESCRIPTION:Non-thermal fixed points in far-from-equilibrium 3D Bose gases\NRésumé: \NFollowing a quantum quench, local observables in many-body systems typically thermal-ize. In certain cases, however, this thermalization occurs via a two-stage process: the systemfirst exhibits universal dynamical scaling laws with strongly non-thermal properties, beforeeventually reaching thermal equilibrium on a longer time scale. This phenomenon is referredto as a non-thermal fixed point.In this talk, I will discuss the non-thermal fixed point that emerges when a 3D Bose gas isquenched across the condensation transition. I will show that it generally involves a transient"weak turbulence" regime, followed at later times by a coarsening dynamics associated withthe slow recombination of vortex lines. Quenches performed exactly at the critical point, incontrast, display a distinct coarsening dynamics, presumably without vortices but involvingthe diffusion of critical fluctuations. If time permits, I will also discuss the robustness ofthis universal dynamics against external perturbations, typically disorder and drive.
X-ALT-DESC;FMTTYPE=text/html:<h2>Non-thermal fixed points in far-from-equilibrium 3D Bose gases</h2><p>Résumé:&nbsp;</p><p>Following a quantum quench, local observables in many-body systems typically thermal-<br />ize. In certain cases, however, this thermalization occurs via a two-stage process: the system<br />first exhibits universal dynamical scaling laws with strongly non-thermal properties, before<br />eventually reaching thermal equilibrium on a longer time scale. This phenomenon is referred<br />to as a non-thermal fixed point.<br />In this talk, I will discuss the non-thermal fixed point that emerges when a 3D Bose gas is<br />quenched across the condensation transition. I will show that it generally involves a transient<br />"weak turbulence" regime, followed at later times by a coarsening dynamics associated with<br />the slow recombination of vortex lines. Quenches performed exactly at the critical point, in<br />contrast, display a distinct coarsening dynamics, presumably without vortices but involving<br />the diffusion of critical fluctuations. If time permits, I will also discuss the robustness of<br />this universal dynamics against external perturbations, typically disorder and drive.</p>
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SUMMARY:[Séminaire atomes froids] Félix Werner (LKB)
CREATED:20260323T101234Z
DTSTAMP:20260323T101234Z
URL:https://www.lptmc.jussieu.fr/vie-scientifique/listeseminaires/seminaire-atomes-froids-felix-werner-lkb
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