Flow Equations for the BCS-BEC Crossover

Details Flow Equations for the BCS-BEC Crossover Flow Equations for the BCS-BEC Crossover

2007-01-10

arxiv.org/abs/cond-mat/0701198v2

Phys.Rev.A76:021602,2007

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevA.76.021602

The functional renormalisation group is used for the BCS-BEC crossover in gases of ultracold fermionic atoms. In a simple truncation, we see how universality and an effective theory with composite bosonic di-atom states emerge. We obtain a unified picture of the whole phase diagram. The flow reflects different effective physics at different scales. In the BEC limit as well as near the critical temperature, it describes an interacting bosonic theory.

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