Quantum Monte Carlo Evidence for d-wave Pairing in the 2D Hubbard Model at a van Hove Singularity

We implement a Quantum Monte Carlo calculation for a repulsive Hubbard model with nearest and next-nearest neighbor hopping interactions on clusters up to 12x12. A parameter region where the Fermi level lies close to the van Hove singularity at the Saddle Points in the bulk band structure is investi...

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Veröffentlicht in:arXiv.org 1996-08
Hauptverfasser: Husslein, T, Morgenstern, I, Newns, D M, Pattnaik, P C, Singer, J M, Matuttis, H G
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Sprache:eng
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Zusammenfassung:We implement a Quantum Monte Carlo calculation for a repulsive Hubbard model with nearest and next-nearest neighbor hopping interactions on clusters up to 12x12. A parameter region where the Fermi level lies close to the van Hove singularity at the Saddle Points in the bulk band structure is investigated. A pairing tendency in the \(d_{x^2-y^2}\) symmetry channel, but no other channel, is found. Estimates of the effective pairing interaction show that it is close to the value required for a 40 K superconductor. Finite-size scaling compares with the attractive Hubbard model.
ISSN:2331-8422
DOI:10.48550/arxiv.9608030