Deformation of anisotropic Fermi surfaces due to electron-electron interactionsR. Roldán1, M. P. López-Sancho1, F. Guinea1 and S.-W. Tsai2
1 Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco E-28049 Madrid, Spain
2 Department of Physics, University of California - Riverside, CA 92521, USA
received 26 July 2006; accepted in final form 17 October 2006
published online 24 November 2006
We analyze the deformations of the Fermi surface induced by electron-electron interactions in anisotropic two-dimensional systems. We use perturbation theory to treat, on the same footing, the regular and singular regions of the Fermi surface. It is shown that, even for weak local coupling, the self-energy presents a nontrivial behavior showing momentum dependence and interplay with the Fermi surface shape. Our scheme gives simple analytical expressions based on local features of the Fermi surface.
74.70.-b - Superconducting materials.
71.27.+a - Strongly correlated electron systems; heavy fermions.
71.18.+y - Fermi surface: calculations and measurements; effective mass, factor.
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