Pseudogap and the Fermi surface in the t-J model
arXiv:cond-mat/0109210 · doi:10.1016/S0022-3697(02)00225-1
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.
Proc. of SNS 2001 (Chicago); submitted to J. of Phys. and Chem. of Solids, 6 RevTex pages, 4 figures (3 color)