Accueil > Agenda Scientifique

28 novembre 2019: 2 événements

séminaire

  • Temperature-driven crossovers and transitions in a coupled boson-fermion system

    Jeudi 28 novembre 11:00-12:00 - Maciej Maska - Department of Theoretical Physics, University of Silesia, Poland

    Temperature-driven crossovers and transitions in a coupled boson-fermion system

    Résumé : Motivated by strongly correlated and frustrated systems, we propose a coupled bose-fermi model in two dimensions that describes the dynamics of pairs of opposite spin fermions scattering from localized bosons. Tracing out one of the degrees of freedom, either the bosons or fermions, generates temperature-dependent long range effective interactions between the entities that we investigate using Monte Carlo techniques. The behavior of bosons is dominated by vortex-antivortex unbinding, with effective inter-boson interactions beyond the nearest neighbor Josephson coupling of phases. Remarkably in the fermion sector we observe a temperature-induced BCS-BEC crossover followed by phase transitions to Anderson and Bose insulator phases, even without quenched disorder.
    Tunneling and angle resolved photoemission spectroscopy on bose-fermi mixtures in cold atomic systems and superconducting islands on graphene are some of the promising experimental platforms to test our predictions.

    Lieu : LPS, bât 510, salle 208a

    En savoir plus : Temperature-driven crossovers and transitions in a coupled boson-fermion system
  • Dynamique des systèmes écologiques : l’étudier, la mobiliser, la préserver"

    Jeudi 28 novembre 13:30-15:00 - Jane Lecomte - AgroParisTech

    Dynamique des systèmes écologiques : l’étudier, la mobiliser, la préserver"

    Lieu : Laboratoire de Physique des Solides - Bat 510, 91405, Orsay

    En savoir plus : Dynamique des systèmes écologiques : l’étudier, la mobiliser, la préserver"