Critical Temperature and Thermodynamics of Attractive Fermions at Unitarity

Evgeni Burovski, Nikolay Prokof'ev, Boris Svistunov, Matthias Troyer

Published 2006-02-09, updated 2006-11-17Version 2

The unitarity regime of the BCS-BEC crossover can be realized by diluting a system of two-component lattice fermions with an on-site attractive interaction. We perform a systematic-error-free finite-temperature simulations of this system by diagrammatic determinant Monte Carlo. The critical temperature in units of Fermi energy is found to be T_c / E_F = 0.152(7). We also report the behavior of the thermodynamic functions, and discuss the issues of thermometry of ultracold Fermi gases.