Critical temperature and thermodynamics of attractive fermions at unitarity

Burovski, Evgeni and Prokof'ev, Nikolay and Svistunov, Boris and Troyer, Matthias (2006) Critical temperature and thermodynamics of attractive fermions at unitarity. Physical review letters, 96. ISSN 1079-7114

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Abstract

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 simulation of this system by diagrammatic determinant Monte Carlo method. The critical temperature in units of Fermi energy is found to be Tc/εF=0.152(7). We also report the behavior of the thermodynamic functions, and discuss the issues of thermometry of ultracold Fermi gases.