Critical Temperature Curve in the BEC-BCS Crossover

Evgeni Burovski 1, Evgeny Kozik 2, Nikolay Prokof'Ev 3, 4, 5, Boris Svistunov 3, 4, Matthias Troyer 6

Physical Review Letters 101 (2008) 090402

The strongly-correlated regime of the BCS-BEC crossover can be realized by diluting a system of two-component fermions with a short-range attractive interaction. We investigate this system via a novel continuous-space-time diagrammatic determinant Monte Carlo method and determine the universal curve $T_c/\epsilon_F$ for the transition temperature between the normal and the superfluid states as a function of the scattering length with the maximum on the BEC side. At unitarity, we confirm that $T_c/\epsilon_F = 0.152(7)$.

  • 1. Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS),
    CNRS : UMR8626 – Université Paris XI - Paris Sud
  • 2. Department of Physics,
    Department of Physics University of Massachussetts
  • 3. Department of Physics,
    University of Massachussetts
  • 4. National Research Centre "Kurchatov Institute" (NRC KI),
    University of Moscow
  • 5. Theoretische Physik, EHT,
    Theoretische Physik, EHT
  • 6. Institut für Theoretische Physik,
    ETH Zurich