DOI: 10.1209/epl/i2003-00223-5
Europhys. Lett., 61 (2) , pp. 228-234 (2003)

Fermi surface renormalization in two spatial dimensions

A. Ferraz

Laboratorio de Supercondutividade, Centro Internacional de Física da Materia Condensada, Universidade de Brasilia - Brasilia, Brasil

(Received 22 March 2002; accepted in final form 4 November 2002)

Abstract
We discuss the renormalization induced by interactions of a two-dimensional truncated Fermi surface (FS) model. Using a field-theoretical renormalization group method, we calculate the critical renormalized physical chemical potential which may take different values along the Fermi surface. We show that FS is strongly renormalized by interactions in two dimensions. As a result of that, FS can be further truncated in those k-space regions where non-trivial fixed points produce a smooth momentum distribution function in the vicinity of the Fermi surface.

PACS
71.10.Pm - Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.).
71.10.Hf - Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems.
74.20.Mn - Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.).

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