Deformation of the Fermi surface in the extended Hubbard model

Details Deformation of the Fermi surface in the extended Hubbard model Deformation of the Fermi surface in the extended Hubbard model

2000-07-07

arxiv.org/abs/cond-mat/0007135v1

Physical Review B 63, 153103 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 ps figures

Scientific paper

10.1103/PhysRevB.63.153103

The deformation of the Fermi surface induced by Coulomb interactions is investigated in the t-t'-Hubbard model. The interplay of the local U and extended V interactions is analyzed. It is found that exchange interactions V enhance small anisotropies producing deformations of the Fermi surface which break the point group symmetry of the square lattice at the Van Hove filling. This Pomeranchuck instability competes with ferromagnetism and is suppressed at a critical value of U(V). The interaction V renormalizes the t' parameter to smaller values what favours nesting. It also induces changes on the topology of the Fermi surface which can go from hole to electron-like what may explain recent ARPES experiments.

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