One-electron self energies and spectral functions for the t-J model in the large-N limit

Abstract

Using a recently developed perturbative approach, which considers Hubbard operators as fundamental excitations, we have performed electronic self-energy and spectral function calculations for the $t-J$ model on the square lattice. We have found that the spectral functions along the Fermi surface are isotropic, even close to the critical doping where the $d$-density wave phase takes place. Fermi liquid behavior with scattering rate $\sim {\omega }^2$ and a finite quasiparticle weight $Z$ was obtained. $Z$ decreases with decreasing doping taking low values for low doping. Results are compared with other ones, analytical and numerical like slave-boson and Lanczos diagonalization finding agreement. We discuss our results in the light of recent $ARPES$ experiments in cuprates.

arXiv comment10 pages, 9 figures, accepted for publication in Phys. Rev. B

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• Doping and temperature dependence of the pseudogap and Fermi arcs in cuprates from $d$-CDW short-range fluctuations in the context of the t-J model
• Self-energy renormalization around the flux phase in the $t-J$ model: Possible implications in underdoped cuprates
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• Self-energy effects in cuprates and the dome-shaped behavior of the superconducting critical temperature
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