Europhys. Lett.
Volume 61, Number 2, January 2003
Page(s) 228 - 234
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 January 2003
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)

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 $\mu_\ab{R}(\frac{\mu}{\omega};U(\omega))$ 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.

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.).

© EDP Sciences 2003