Pseudogap and the Fermi surface in the t-J model

Details Pseudogap and the Fermi surface in the t-J model Pseudogap and the Fermi surface in the t-J model

2001-09-12

arxiv.org/abs/cond-mat/0109210v1

Physics

Condensed Matter

Strongly Correlated Electrons

Proc. of SNS 2001 (Chicago); submitted to J. of Phys. and Chem. of Solids, 6 RevTex pages, 4 figures (3 color)

Scientific paper

10.1016/S0022-3697(02)00225-1

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.

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