Microscopic description of d-wave superconductivity by Van Hove nesting in the Hubbard model

Details Microscopic description of d-wave superconductivity by Van Hove nesting in the Hubbard model Microscopic description of d-wave superconductivity by Van Hove nesting in the Hubbard model

2000-04-27

arxiv.org/abs/cond-mat/0004480v1

Phys. Rev. B 63, 024502 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 Postscript figures

Scientific paper

10.1103/PhysRevB.63.024502

We devise a computational approach to the Hubbard model that captures the strong coupling dynamics arising when the Fermi level is at a Van Hove singularity in the density of states. We rely on an approximate degeneracy among the many-body states accounting for the main instabilities of the system (antiferromagnetism, d-wave superconductivity). The Fermi line turns out to be deformed in a manner consistent with the pinning of the Fermi level to the Van Hove singularity. For a doping rate $\delta \sim 0.2$, the ground state is characterized by d-wave symmetry, quasiparticles gapped only at the saddle-points of the band, and a large peak at zero momentum in the d-wave pairing correlations.

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