Instability of Anisotropic Fermi Surfaces in Two Dimensions

Details Instability of Anisotropic Fermi Surfaces in Two Dimensions Instability of Anisotropic Fermi Surfaces in Two Dimensions

1997-03-31

arxiv.org/abs/cond-mat/9703254v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, revtex

Scientific paper

10.1103/PhysRevLett.79.3514

The effect of strong anisotropy on the Fermi line of a system of correlated electrons is studied in two space dimensions, using renormalization group techniques. Inflection points change the scaling exponents of the couplings, enhancing the instabilities of the system. They increase the critical dimension for non Fermi liquid behavior, from 1 to 3/2. Assuming that, in the absence of nesting, the dominant instability is towards a superconducting ground state, simple rules to discern between d-wave and extended s-wave symmetry of the order parameter are given.

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