Gutzwiller variational theory for the Hubbard model with attractive interaction

Details Gutzwiller variational theory for the Hubbard model with attractive interaction Gutzwiller variational theory for the Hubbard model with attractive interaction

2005-03-14

arxiv.org/abs/cond-mat/0503334v1

J. Phys.: Condens. Matter 17 3807-3814 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 2 figures

Scientific paper

10.1088/0953-8984/17/25/007

We investigate the electronic and superconducting properties of a negative-U Hubbard model. For this purpose we evaluate a recently introduced variational theory based on Gutzwiller-correlated BCS wave functions. We find significant differences between our approach and standard BCS theory, especially for the superconducting gap. For small values of $|U|$, we derive analytical expressions for the order parameter and the superconducting gap which we compare to exact results from perturbation theory.

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