Physical Review Letters 97 036401 (2006)
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Using the dynamical cluster approximation we calculate the single-particle spectra of the Hubbard model with next-nearest neighbor hopping t' at small doping. 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 only 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 in the magnetic susceptibility and produce shadow states which develop a pseudogap with decreasing temperature.
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