Pseudogap and antiferromagnetic correlations in the Hubbard model

Details Pseudogap and antiferromagnetic correlations in the Hubbard model Pseudogap and antiferromagnetic correlations in the Hubbard model

2005-09-07

arxiv.org/abs/cond-mat/0509166v2

Phys. Rev. Lett. 97, 036401 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.97.036401

Using the dynamical cluster approximation and quantum monte carlo we calculate the single-particle spectra of the Hubbard model with next-nearest neighbor hopping $t'$. 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 of $t'$ on the low energy ARPES spectra is weak except close to the zone edge. The short range correlations are sufficient to yield a pseudogap signal in the magnetic susceptibility, produce a concomitant gap in the single-particle spectra near $(\pi,\pi/2)$ but not necessarily at a location in the proximity of Fermi surface.

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