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

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.16179· OSTI ID:399832

Husslein, T; Morgenstern, I; Newns, D M; Pattnaik, P C; Singer, J M; Matuttis, H G ^[1]

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1. IBM Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598 (United States)

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{times}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 {ital d}{sub {ital x}{sup 2}{minus}{ital y}{sup 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. {copyright}{ital 1996 The American Physical Society.}

• OSTI ID: 399832
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 22 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COMPUTERIZED SIMULATION
D WAVES
ELECTRONIC STRUCTURE
FERMI LEVEL
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
MONTE CARLO METHOD
PAIRING INTERACTIONS
PHASE DIAGRAMS
SCALING LAWS
TRANSITION TEMPERATURE