Volume 34, Number 9, June III 1996
|Page(s)||711 - 716|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Renormalization group analysis of electrons near a van Hove singularity
Instituto de Estructura de la Materia,
Consejo Superior de Investigaciones Científicas,
Serrano 123, 28006 Madrid, Spain
2 Instituto de Ciencia de Materiales, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain
3 Departamento de Matemáticas, Universidad Carlos III, Butarque 15, Leganés, 28913 Madrid, Spain
A model of interacting two-dimensional electrons near a van Hove singularity is studied, using renormalization group techniques. The coupling constants show a logarithmic dependence on the high-energy cut-off, unlike in conventional Fermi liquids. The chemical potential tends to be renormalized towards the van Hove energy. Scattering of pairs between the two inequivalent singularities of a square lattice can lead to anisotropic superconductivity.
PACS: 75.10.Jm – Quantized spin models / 75.10.Lp – Band and itinerant models / 75.30.Ds – Spin waves
© EDP Sciences, 1996
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