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

MAT´ıAS BEJAS, GUILLERMO BUZON, ANDR´ES GRECO, AND ADRIANA FOUSSATS

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

American Physical Sociaty

Año: 2011 vol. 83 p. 4514 - 20000

0163-1829

At mean-field level the t -J model shows a phase diagram with close analogies to the phase diagram ofhole-doped cuprates. An order parameter associated with the flux or d charge-density wave (d-CDW) phasecompetes and coexists with superconductivity at low doping, showing characteristics identified with the observedpseudogap in underdoped cuprates. In addition, in the d-CDW state the Fermi surface is reconstructed towardpockets with low spectral weight in the outer part, resembling the arcs observed in angle-resolved photoemissionspectroscopy experiments. However, the d-CDW requires broken translational symmetry, a fact that is notcompletely accepted. Including self-energy corrections beyond the mean field, we found that the self-energycan be written as two distinct contributions. One of these (called flux) dominates at low energy and originatesfrom the scattering between carriers and d-CDWfluctuations in proximity to the d-CDWinstability. The secondcontribution (calledRλ) dominates at large energy and originates from the scattering between charge fluctuationsunder the constraint of nondouble occupancy. In this paper it is shown that flux is responsible for the origin oflow-energy features in the spectral function as a pseudogap and Fermi arcs. The obtained doping and temperaturedependence of the pseudogap and Fermi arcs is similar to that observed in experiments. At low energy, Rλ givesan additional contribution to the closure of the pseudogap.