Renormalization Group Technique for Quasi-one-dimensional Interacting Fermion Systems at Finite Temperature

Details Renormalization Group Technique for Quasi-one-dimensional Interacting Fermion Systems at Finite Temperature Renormalization Group Technique for Quasi-one-dimensional Interacting Fermion Systems at Finite Temperature

2002-04-08

arxiv.org/abs/cond-mat/0204163v1

Theoretical Methods for Strongly Correlated Electrons, CRM Series in Mathematical Physics, David S\'en\'echal, Andr\'e-Marie T

Physics

Condensed Matter

Strongly Correlated Electrons

LateX, 43 pages, 21 figures, Springer Verlag macros. Proc. of International CRM Workshop on Theoretical Methods in Strongly Co

Scientific paper

We review some aspects of the renormalization group method for interacting fermions. Special emphasis is placed on the application of scaling theory to quasi-one-dimensional systems at non zero temperature. We begin by introducing the scaling ansatz for purely one-dimensional fermion systems and its extension when interchain coupling and dimensionality crossovers are present at finite temperature. Next, we review the application of the renormalization group technique to the one-dimensional electron gas model and clarify some peculiarities of the method at the two-loop level. The influence of interchain coupling is then included and results for the crossover phenomenology and the multiplicity of characteristic energy scales are summarized. The emergence of the Kohn-Luttinger mechanism in quasi-one-dimensional electronic structures is discussed fo both superconducting and density-wave channels.

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