Renormalization group for interacting fermions in d > 1
作者： R. Shankar
DOI: 10.1016/0375-9601(92)90960-T
关键词: Lattice (order) 、 Functional renormalization group 、 Renormalization group 、 Theoretical physics 、 Fermion 、 Quantum mechanics 、 Physics 、 Landau theory
摘要: Abstract A renormalization group transformation (RGT) that permits us to analyze the stability of fermionic systems various perturbations in any number dimensions is developed. An RGT leaves invariant free fermion system (on or off a lattice) defined and interactions are classified as relevant, irrelevant marginal. It shown how automatically considers competing instabilities simultaneously, contrast mean-field theory, which focuses on just one. weak coupling only BCS relevant unless there nesting. Both Landau theory Kohn-Luttinger argument viewed light group.
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