Pseudogap and antiferromagnetic correlations in the Hubbard model

Macridin, Alexandru; Jarrell, Mark; Maier, Thomas; Kent, P. R. C.; D'Azevedo, Eduardo

Pseudogap and antiferromagnetic correlations in the Hubbard model

Authors

Description

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 $(0,π)$ 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 $(π,π/2)$ but not necessarily at a location in the proximity of Fermi surface.
5 pages, 4 figures