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X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20251125T140000
DTEND;TZID=Europe/Paris:20251125T180000
DTSTAMP:20251030T160800
UID:MEC-67ed94744426295f96268f4ac1881b46@lps.u-psud.fr
CREATED:20251030
LAST-MODIFIED:20251030
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:Kilian FRABOULET : Competing orders in many-electron systems: A renormalization group perspective
DESCRIPTION:\nKilian FRABOULET, Max Planck Institute for Solid State Research, Stuttgart\n\n\n\nLe résumé :\n\n\n\nThe renormalization group is an established approach to study quantum many-body systems, and this applies especially to one of its modern implementations known as functional renormalization group (FRG). In particular, the FRG constitutes a flexible and unbiased tool for the study of competing orders.     I will outline recent progress in this direction for correlated electron systems. For this, I will first discuss the competition between antiferromagnetism, charge density waves and superconductivity in the 2D Hubbard model, thus making a connection with cuprate superconductors. The relation between FRG and well-known techniques (RPA, GW approximation, parquet equations, density functional theory) and the special role of bosonization methods will be emphasized along the way. I will also show how the FRG can be combined with dynamical mean-field theory to treat strongly-interacting regimes, with a focus on d-wave superconductivity. As a next step, I will increase the complexity of the model including non-local interactions and discuss unconventional superconductivity in an extended Hubbard model with a connection to moiré materials. Special consideration will also be given to the treatment of retarded interactions with electron-phonon couplings. Finally, I will also highlight recent FRG studies of quantum criticality in Dirac materials, with a connection to graphene.\n
URL:https://www.lps.u-psud.fr/events/kilian-fraboulet-competing-orders-in-many-electron-systems-a-renormalization-group-perspective/
CATEGORIES:Séminaire de la Théorie de la Matière Condensée,Séminaires
LOCATION:Moyen amphi (LPS) + ONLINE (Zoom)
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