title: Pseudogap and antiferromagnetic correlations in the hubbard model.
abstract: Using the dynamical cluster approximation and quantum Monte Carlo simulations we calculate the single-particle spectra of the Hubbard model with next-nearest neighbor hopping . In the underdoped region, we find that the pseudogap along the zone diagonal in the electron doped systems is due to long-range antiferromagnetic correlations. The physics in the proximity of (0, pi) is dramatically influenced by t' and determined by the short range correlations. The effect t' of on the low-energy angle-resolved photoemission spectroscopy spectra is weak except close to the zone edge. The short range correlations are sufficient to yield a pseudogap signal in the magnetic susceptibility and produce a concomitant gap in the single-particle spectra near (pi, pi/2), but not necessarily at a location in the proximity of the Fermi surface.
authors.affiliation: University of Cincinnati, Cincinnati, Ohio, 45221, USA.
authors.forename: Alexandru
authors.initials: A
authors.lastname: Macridin
authors.forename: M
authors.initials: M
authors.lastname: Jarrell
authors.forename: Thomas
authors.initials: T
authors.lastname: Maier
authors.forename: P R C
authors.initials: PR
authors.lastname: Kent
authors.forename: Eduardo
authors.initials: E
authors.lastname: D'Azevedo