Quantum Monte Carlo evidence for d-wave pairing in the two-dimensional Hubbard model at a van Hove singularity

DOI zum Zitieren dieses Dokuments:: 10.5283/epub.16099

Husslein, T. ; Morgenstern, Ingo ; Newns, D. M ; Pattnaik, P. C. ; Singer, J. M. ; Matuttis, H. G.

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Veröffentlichungsdatum dieses Volltextes: 09 Aug 2010 12:09

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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 12×12. 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 dx2-y2 symmetry channel, but no other channel, is found. ...