Finite-range effects in dilute Fermi gases at unitarity

Details Finite-range effects in dilute Fermi gases at unitarity Finite-range effects in dilute Fermi gases at unitarity

2011-10-07

arxiv.org/abs/1110.1441v2

Phys. Rev. A 84 043639 (2011)

Physics

Condensed Matter

Quantum Gases

7 pages, 3 figures. v2: Corrected typos in the main text and in the references

Scientific paper

10.1103/PhysRevA.84.043639

We develop a theoretical method going beyond the contact-interaction approximation frequently used in mean-field theories of many-fermion systems, based on the low-energy T-matrix of the pair potential to rigorously define the effective radius of the interaction. One of the main consequences of our approach is the possibility to investigate finite-density effects, which are outside the range of validity of approximations based on delta-like potentials. We apply our method to the calculation of density dependent properties of an ultracold gas of 6Li atoms at unitarity, whose two-body interaction potential is calculated using ab initio quantum chemistry methods. We find that density effects will be significant in ultracold gases with densities one order of magnitude higher than those attained in current experiments.

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