Physics – Condensed Matter – Quantum Gases
Scientific paper
2009-11-24
Phys.Rev.A81:043628,2010
Physics
Condensed Matter
Quantum Gases
5 pages, 2 pictures
Scientific paper
We study the ratio between the fermion-fermion scattering length and the dimer-dimer scattering length for systems of nonrelativistic fermions, using the same functional renormalisation technique as previously applied to fermionic matter. We find a strong dependence on the cutoff function used in the renormalisation flow for a two-body truncation of the action. Adding a simple three-body term substantially reduces this dependence.
Birse Michael C.
Krippa Boris
Walet Niels R.
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