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DTSTART;TZID=Europe/Paris:20261113T110000
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DTSTAMP:20261106T132237Z
CREATED:20261103T215003Z
LAST-MODIFIED:20261106T132237Z
UID:10000342-1794567600-1794571200@sfp-alpes.fr
SUMMARY:Budhaditya BHATTACHARJEE (University of Luxembourg)
DESCRIPTION:Mechanisms for Chaotic Transitions in Many-Body Systems\nLe séminaire théorie est financé par la fédération de recherche Quantalps. \nRésumé : \nA widely observed phenomenon in interacting systems of many particles is a phase transition from a chaotic to an integrable/non-chaotic phase and vice versa. The mechanism which controls such a transition is strongly model-dependent. It is therefore necessary to develop a model of such chaotic transitions which picks up the model-independent features and explains the nature of the transition. I will present and discuss two potential mechanisms which describe such transitions. The first mechanism\, titled « network classes » addresses integrable-to-chaotic transitions and separates systems into universality classes. Inspired from classical dynamics\, I will extend its’ definition to quantum systems. In the process\, I will also introduce quantum analogues of known classical chaos markers. I will discuss where such a description works and where it fails through a quantum—classical correspondence. Then I will present the next mechanism\, titled « scale separation » which will address chaotic-to-integrable transitions. I will discuss it purely in a quantum setup by constructing a (semi=solvable) model which explicitly realizes this mechanism. I will present the various properties of this model show how such a transition may occur. I will conclude with comments and future directions on developing better descriptions of such transitions. \n_ \nContact : loic.herviou@lpmmc.cnrs.fr \n 
URL:https://sfp-alpes.fr/event/budhaditya-bhattacharjee-university-of-luxembourg/
LOCATION:LPMMC – salle Roger Maynard (G421)\, CNRS - LPMMC 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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