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Bünemann J, Gebhard F, Radnóczi K, et al. Gutzwiller variational theory for the Hubbard model with attractive interaction. J Phys Condens Matter. 2005;17(25):3807-14doi: 10.1088/0953-8984/17/25/007.
Bünemann, J., Gebhard, F., Radnóczi, K., & Fazekas, P. (2005). Gutzwiller variational theory for the Hubbard model with attractive interaction. Journal of physics. Condensed matter : an Institute of Physics journal, 17(25), 3807-14. https://doi.org/10.1088/0953-8984/17/25/007
Bünemann, Jörg, et al. "Gutzwiller variational theory for the Hubbard model with attractive interaction." Journal of physics. Condensed matter : an Institute of Physics journal vol. 17,25 (2005): 3807-14. doi: https://doi.org/10.1088/0953-8984/17/25/007
Bünemann J, Gebhard F, Radnóczi K, Fazekas P. Gutzwiller variational theory for the Hubbard model with attractive interaction. J Phys Condens Matter. 2005 Jun 29;17(25):3807-14. doi: 10.1088/0953-8984/17/25/007. Epub 2005 Jun 10. PMID: 21690697.
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J Phys Condens Matter. 2005 Jun 29;17(25):3807-14. doi: 10.1088/0953-8984/17/25/007. Epub 2005 Jun 10.

Gutzwiller variational theory for the Hubbard model with attractive interaction.

Journal of physics. Condensed matter : an Institute of Physics journal

Jörg Bünemann, Florian Gebhard, Katalin Radnóczi, Patrik Fazekas

Affiliations

  1. Fachbereich Physik, Philipps-Universität Marburg, D-35032 Marburg, Germany.

PMID: 21690697 DOI: 10.1088/0953-8984/17/25/007

Abstract

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 wavefunctions. 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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