Pairing and Superfluid Properties of Dilute Fermion Gases at Unitarity

Abstract

We study the system of a dilute gas of fermions in 3-dimensions, with attractive interactions tuned to the unitarity point, using the non-perturbative Restricted Path Integral Monte Carlo (R-PIMC) method. The pairing and superfluid properties of this system are calculated at finite temperature. The total energy at very low temperature from our results agrees closely with that of previous ground-state Quantum Monte Carlo calculations. We identify the temperature $T^{\ast }\approx 0.70{\epsilon }_F$ below which pairing correlations develop, and estimate the critical temperature for the superfluid transition $T_c\approx 0.25{\epsilon }_F$ from a finite size scaling analysis of the superfluid density.

4 pages, 4 figures, To be submitted to PRL Minor errors corrected

References in corpus (3)

• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Critical Temperature and Thermodynamics of Attractive Fermions at Unitarity

Cited by in corpus (12)

• Many-Body Physics with Ultracold Gases
• Theory of ultracold Fermi gases
• Universal Properties of the Ultra-Cold Fermi Gas
• Virial expansion for a strongly correlated Fermi gas
• Critical Temperature Curve in the BEC-BCS Crossover
• Particle-hole fluctuations in the BCS-BEC Crossover
• Comparative study of strong coupling theories of a trapped Fermi gas at unitarity
• Thermodynamics of a trapped unitary Fermi gas
• Variational theory of two-fluid hydrodynamic modes at unitarity
• Shell-Model Monte Carlo Simulations of BCS-BEC Crossover in Few-Fermion Systems
• Fermionic quantum criticality and the fractal nodal surface
• Unitary Fermi gas in the epsilon expansion