Critical temperature and thermodynamics of attractive fermions at unitarity

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 te...

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Bibliographic Details
Published in:Physical review letters 2006-04, Vol.96 (16), p.160402-160402, Article 160402
Main Authors: Burovski, Evgeni, Prokof'ev, Nikolay, Svistunov, Boris, Troyer, Matthias
Format: Article
Language:English
Subjects:
BCS THEORY
BOSE-EINSTEIN CONDENSATION
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL TEMPERATURE
ERRORS
FERMI GAS
FERMIONS
MONTE CARLO METHOD
SIMULATION
THERMODYNAMICS
UNITARITY
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Summary: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 T(C)/epsilonF=0.152(7). We also report the behavior of the thermodynamic functions, and discuss the issues of thermometry of ultracold Fermi gases.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.96.160402