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Pseudogap and the Fermi surface in the t-J model

A. Ramsak·P. Prelovsek
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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.

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A. Ramsak, P. Prelovsek. 2001-09-12. Pseudogap and the Fermi surface in the t-J model. https://doi.org/10.1016/s0022-3697(02)00225-1

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