Efimov effect from functional renormalization

Details Efimov effect from functional renormalization Efimov effect from functional renormalization

2008-12-02

arxiv.org/abs/0812.0528v2

Phys. Rev. A 79, 042705 (2009)

Physics

Condensed Matter

Statistical Mechanics

21 pages, 6 figures, minor changes, published version

Scientific paper

10.1103/PhysRevA.79.042705

We apply a field-theoretic functional renormalization group technique to the few-body (vacuum) physics of non-relativistic atoms near a Feshbach resonance. Three systems are considered: one-component bosons with U(1) symmetry, two-component fermions with U(1)\times SU(2) symmetry and three-component fermions with U(1) \times SU(3) symmetry. We focus on the scale invariant unitarity limit for infinite scattering length. The exact solution for the two-body sector is consistent with the unitary fixed point behavior for all considered systems. Nevertheless, the numerical three-body solution in the s-wave sector develops a limit cycle scaling in case of U(1) bosons and SU(3) fermions. The Efimov parameter for the one-component bosons and the three-component fermions is found to be approximately s=1.006, consistent with the result of Efimov.

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