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DTSTART;TZID=Europe/Paris:20261110T140000
DTEND;TZID=Europe/Paris:20261110T150000
DTSTAMP:20261016T130711Z
CREATED:20261016T122138Z
LAST-MODIFIED:20261016T130711Z
UID:6816-1794319200-1794322800@lpt.univ-tlse3.fr
SUMMARY:Matrices d’influence multibains : lois d’échelle universelles issues de la dynamique en temps réel
DESCRIPTION:Michael Sonner (UC Berkeley) \n  \nWe introduce a framework for describing the real-time dynamics of quantum\nimpurity models out of equilibrium which is based on the influence matrix\napproach. By replacing the dynamical map of a large fermionic quantum\nenvironment with an effective semi-group influence matrix (SGIM) which acts on\na reduced auxiliary space\, we overcome the limitations of previous proposals\,\nachieving high accuracy at long evolution times\, which we demonstrate by\ncomputing the spectral function of the single impurity Anderson model. Once the\neffective compressed baths are obtained\, they can then be used as building\nblocks\, allowing the study of more complex models such as the two impurity\nAnderson model. At a coupling strength between the two dots comparable to the\nKondo scale this model is known to host a two channel Kondo like non-fermi\nliquid point. We study this critical point by considering dynamical observables\nsuch as the relaxation time after a quench and the work exerted on a ramp\nthrough the critical point exhibiting Kibble Zurek like physics. Finally I’ll\ndiscuss applications of this method to non-equilibrium dynamical mean field\ntheory. \n  \nContact : N. Laflorencie
URL:https://lpt.univ-tlse3.fr/evenement/seminaire10novembre2026/
CATEGORIES:Séminaire
ATTACH;FMTTYPE=image/png:https://lpt.univ-tlse3.fr/wp-content/uploads/2026/10/Sonner.png
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DTSTART;TZID=Europe/Paris:20261117T140000
DTEND;TZID=Europe/Paris:20261117T150000
DTSTAMP:20261011T174913Z
CREATED:20261004T195136Z
LAST-MODIFIED:20261011T174913Z
UID:6743-1794924000-1794927600@lpt.univ-tlse3.fr
SUMMARY:Quantum Fluctuations in 1d Many-Body Transport: Hydrodynamics and Beyond
DESCRIPTION:Stafano Scopa (King’s College London) \nTransport in one-dimensional quantum many-body systems can display very different hydrodynamic regimes\, ranging from ballistic propagation in integrable systems to diffusion in stochastic systems. While hydrodynamics provides an effective description of the large-scale evolution of conserved quantities\, a natural next question concerns the fluctuations around this macroscopic dynamics\, and in particular those retaining quantum-coherent features surviving at large scales. \nI will discuss recent results in this direction. I will first focus on inhomogeneous one-dimensional Bose gases\, where Generalized Hydrodynamics describes the evolving background state\, while quantum fluctuations around it can be formulated in terms of an effective low-energy theory closely related to Luttinger-liquid and conformal-field-theory ideas. This framework gives access to quantities such as long-range correlations and entanglement throughout the nonequilibrium evolution. \nI will then briefly discuss the complementary diffusive setting of stochastic quantum many-body systems\, where macroscopic fluctuation theory provides the natural large-scale description and raises the question of how quantum-coherent fluctuations can be incorporated beyond its standard classical formulation. \nContact : Z. Ristivojevic
URL:https://lpt.univ-tlse3.fr/evenement/seminar17novembre2026-fr/
CATEGORIES:Séminaire
ATTACH;FMTTYPE=image/jpeg:https://lpt.univ-tlse3.fr/wp-content/uploads/2026/10/drawing-1-scaled.jpg
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