Renormalization group flows into phases with broken symmetry

Details Renormalization group flows into phases with broken symmetry Renormalization group flows into phases with broken symmetry

2004-09-28

arxiv.org/abs/cond-mat/0409725v1

Prog. Theor. .Phys. 112, No. 6 (2004) 943-970

Physics

Condensed Matter

Strongly Correlated Electrons

30 pages, LaTeX, 8 figures

Scientific paper

10.1143/PTP.112.943

We describe a way to continue the fermionic renormalization group flow into phases with broken global symmetry. The method does not require a Hubbard-Stratonovich decoupling of the interaction. Instead an infinitesimally small symmetry-breaking component is inserted in the initial action, as an initial condition for the flow of the selfenergy. Its flow is driven by the interaction and at low scales it saturates at a nonzero value if there is a tendency for spontaneous symmetry breaking in the corresponding channel. For the reduced BCS model we show how a small initial gap amplitude flows to the value given by the exact solution of the model. We also discuss the emergence of the Goldstone boson in this approach.

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