Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines physics
Date Mardi 30 Novembre 2021
Heure 17:15
Salle Amphi Jaurès - Ecole normale supérieure 29 rue d'Ulm 75005 PARIS
Nom de l'orateur Dalibard
Prenom de l'orateur Jean
Addresse email de l'orateur
Institution de l'orateur Collège de France
Titre Scale invariance for quantum fluids: solitons and breathers in a 2D gas
Résumé The physics of many-body systems strongly depends on their dimensionality. With the realization of quantum wells for example, it has been possible to produce two-dimensional gases of electrons, which exhibit properties that differ dramatically from the standard three-dimensional case. More recently, a novel environment has been developed for the study of quantum physics in low dimension. It consists of cold atomic gases confined in tailor-made light traps, forming a thin layer of material particles. In this talk I will present some recent investigations of the physics of 2D Bose gases, in relation with their scale and conformal invariance. In particular I will show an unexpected result: there exist "breathers", i.e. specific initial shapes that lead to a periodic evolution of the fluid, in spite of the multi-modal and non-linear character of its equations of motion.
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