Doping and temperature dependence of the pseudogap and Fermi arcs in cuprates from d-CDW with short-range fluctuations in the context of the t- J model.

MATÍAS BEJAS, GUILLERMO BUZON, ANDRÉS GRECO, AND ADRIANA FOUSSATS

PHYSICAL REVIEW B

AMER PHYSICAL SOC

Lugar: New York; Año: 2011 vol. 83 p. 14514 - 14514

1098-0121

At mean-field level the t-J model shows a phase diagram with close analogies to the phase diagram of hole-doped cuprates. An order parameter associated with the flux or d charge-density wave (d-CDW) phase competes and coexists with superconductivity at low doping, showing characteristics identified with the observed pseudogap in underdoped cuprates. In addition, in the d-CDW state the Fermi surface is reconstructed toward pockets with low spectral weight in the outer part, resembling the arcs observed in angle-resolved photoemission spectroscopy experiments. However, the d-CDW requires broken translational symmetry, a fact that is not completely accepted. Including self-energy corrections beyond the mean field, we found that the self-energy can be written as two distinct contributions. One of these (called ∑ flux) dominates at low energy and originates from the scattering between carriers and d-CDW fluctuations in proximity to the d-CDW instability. The second contribution (called ∑ Rλ) dominates at large energy and originates from the scattering between charge fluctuations under the constraint of nondouble occupancy. In this paper it is shown that ∑ flux is responsible for the origin of low-energy features in the spectral function as a pseudogap and Fermi arcs. The obtained doping and temperature dependence of the pseudogap and Fermi arcs is similar to that observed in experiments. At low energy, ∑ Rλ gives an additional contribution to the closure of the pseudogap.