Spectral functions and pseudogap in the t-J model
Strongly Correlated Electrons
2009-10-31 v2
Abstract
We calculate spectral functions within the t-J model as relevant to cuprates in the regime from low to optimum doping. On the basis of equations of motion for projected operators an effective spin-fermion coupling is derived. The self energy due to short-wavelength transverse spin fluctuations is shown to lead to a modified selfconsistent Born approximation, which can explain strong asymmetry between hole and electron quasiparticles. The coupling to long-wavelength longitudinal spin fluctuations governs the low-frequency behavior and results in a pseudogap behavior, which at low doping effectively truncates the Fermi surface.
Cite
@article{arxiv.cond-mat/0011089,
title = {Spectral functions and pseudogap in the t-J model},
author = {P. Prelovsek and A. Ramsak},
journal= {arXiv preprint arXiv:cond-mat/0011089},
year = {2009}
}
Comments
Minor corrections; to appear in Phys. Rev. B (RC)