Parametrization of Nambu Vertex in a Singlet Superconductor(Condensed Matter Physics)
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概要
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We analyze general properties of the effective Nambu two-particle vertex and its renormalization group flow in a spin-singlet superconductor. In a fully spin-rotation invariant form the Nambu vertex can be expressed by only three distinct components. Solving exactly the flow of a mean-field model with reduced BCS and forward scattering interactions, we gain insight into the singularities in the momentum and energy dependences of the vertex at and below the critical energy scale for superconductivity. Using a decomposition of the vertex in various interaction channels, we manage to isolate singular momentum and energy dependences in only one momentum and energy variable for each term, such that the singularities can be efficiently parametrized.
- 2010-09-25
著者
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EBERLEIN Andreas
Max-Planck-Institute for Solid State Research
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METZNER Walter
Max-Planck-Institute for Solid State Research
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Metzner Walter
Max-planck-institut Fur Festkorperforschung
関連論文
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- Renormalization Group Flows into Phases with Broken Symmetry(Condensed Matter and Statistical Physics)
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