Electron-lattice coupling and partial nesting as the origin of Fermi arcs in manganites

We present a detailed Monte Carlo study of the one-particle spectral function using a double-exchange model for layered manganites, incorporating lattice distortions. Our results contribute to clarifying the physical origin of the Fermi arcs observed in ARPES experiments on bilayered manganites.\footnote{Manella {\it el al.} Nature 438, 474 (2005)} In a range of parameters where no broken symmetry phase exists, the nearly-nested Fermi surface favors particular correlations between the Jahn-Teller distortions. Due to these correlations, the spectral weight is surpresed near the Brillouin zone edge, while a quasiparticle peak survives in the zone diagonal. This regime manifests as a pseudogap in the density of states, and produces a Fermi-arc like Fermi surface.\footnote{Salafranca {\it el al.} Phys. Rev. B 80, 155133 (2009)} We also discuss the stability of the pseudogap varying the temperature and the electron-lattice coupling strength for different hole dopings.