Self-energy corrections to anisotropic Fermi surfaces

Details Self-energy corrections to anisotropic Fermi surfaces Self-energy corrections to anisotropic Fermi surfaces

2006-12-14

arxiv.org/abs/cond-mat/0612368v1

PRB 74, 235109 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 10 figures

Scientific paper

10.1103/PhysRevB.74.235109

The electron-electron interactions affect the low-energy excitations of an electronic system and induce deformations of the Fermi surface. These effects are especially important in anisotropic materials with strong correlations, such as copper oxides superconductors or ruthenates. Here we analyze the deformations produced by electronic correlations in the Fermi surface of anisotropic two-dimensional systems, treating the regular and singular regions of the Fermi surface on the same footing. Simple analytical expressions are obtained for the corrections, based on local features of the Fermi surface. It is shown that, even for weak local interactions, the behavior of the self-energy is non trivial, showing a momentum dependence and a self-consistent interplay with the Fermi surface topology. Results are compared to experimental observations and to other theoretical results.

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