Landau-Fermi liquid analysis of the 2D t-t' Hubbard model

Details Landau-Fermi liquid analysis of the 2D t-t' Hubbard model Landau-Fermi liquid analysis of the 2D t-t' Hubbard model

2002-04-17

arxiv.org/abs/cond-mat/0204380v1

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 16 figures

Scientific paper

10.1140/epjb/e2002-00200-4

We calculate the Landau interaction function f(k,k') for the two-dimensional t-t' Hubbard model on the square lattice using second and higher order perturbation theory. Within the Landau-Fermi liquid framework we discuss the behavior of spin and charge susceptibilities as function of the onsite interaction and band filling. In particular we analyze the role of elastic umklapp processes as driving force for the anisotropic reduction of the compressibility on parts of the Fermi surface.

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