Xavier Leyronas

Xavier Leyronas is a Professor of Physics at Sorbonne Université, based at the Laboratoire de Physique de l'ENS (Ecole Normale Supérieure) in Paris. His office is located at 24 rue Lhomond, 75231 Paris Cedex 05, room E 235, with contact number +33 1 44 32 34 76. He teaches Condensed Matter Theory (Master 2), Superconductivity (Master 2), Thermal Physics (Licence 3), and Thermodynamics (Licence 2), and oversees the third year of Sorbonne Université's Licence de Physique program.

His research spans key areas of theoretical condensed matter physics:

• Ultracold Quantum Gases: Polarons, dimers, trimers, BEC-BCS crossover, virial expansion, hydrodynamic modes, and few-body problems using Feynman diagrams
• Superconductivity: High-temperature superconductors, Eliashberg theory, and Cu-O plane-chain models
• Mesoscopic Physics: Anderson localization in Fock space, excitons, and electronic transport through Kondo impurities

Analysis of his recent publications reveals sustained focus on impurity physics in ultracold Fermi gases, where he develops theoretical frameworks for polarons and few-body bound states. His work bridges many-body physics and quantum mechanics, frequently employing diagrammatic techniques to address superfluidity and superconductivity phenomena.

Professor Leyronas is affiliated with the Laboratoire de Physique de l'ENS (LPS), a CNRS unit (UMR 8550) jointly operated by Ecole Normale Supérieure, Sorbonne Université, and Université Paris Cité, providing a collaborative hub for theoretical and experimental condensed matter research.