Configuration-interaction approach to the two-dimensional Hubbard model near half-filling

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.9558· OSTI ID:560702

Friedman, B ^[1]; Levine, G ^[2]

---

1. Department of Physics, Sam Houston State University, Huntsville, Texas 77341 (United States)
2. Department of Physics, Hofstra University, Hempstead, New York 11550 (United States)

The two-dimensional Hubbard model near half-filling is studied using a configuration-interaction method. Superconducting order-parameter and spin-spin correlation functions are calculated as functions of distance to probe for superconductivity and antiferromagnetism. Consistent with our previous results, these more extensive calculations point toward d-wave superconductivity in the ground state of the two-dimensional repulsive Hubbard model. The d-wave correlations tend to increase with interaction strength, size of the state space used in the calculation, and doping away from half-filling. The superconducting correlations on the Fermi surface are interpreted as d-wave pairing between spin density-wave quasiparticles. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 560702
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 15 Vol. 55; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANTIFERROMAGNETISM
CONFIGURATION INTERACTION
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
ORDER PARAMETERS
PAIRING INTERACTIONS
QUASI PARTICLES
SPIN ORIENTATION
SUPERCONDUCTIVITY
TWO-DIMENSIONAL CALCULATIONS