Flow Equations for the BCS-BEC Crossover

C. Wetterich; H. Gies; J. M. Pawlowski; S. Diehl

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Flow Equations for the BCS-BEC Crossover

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arxiv cond-mat/0701198 v2 pith:PYBLTTX4 submitted 2007-01-10 cond-mat.supr-con cond-mat.stat-mechhep-phquant-ph

Flow Equations for the BCS-BEC Crossover

S. Diehl , H. Gies , J. M. Pawlowski , C. Wetterich This is my paper

classification cond-mat.supr-con cond-mat.stat-mechhep-phquant-ph

keywords bcs-becbosoniccrossoverdifferenteffectiveflowtheoryatoms

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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.

Flow Equations for the BCS-BEC Crossover

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