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Spectral functions and pseudogap in the t-J model

P. Prelovsek·A. Ramsak
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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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P. Prelovsek, A. Ramsak. 2001-02-28. Spectral functions and pseudogap in the t-J model. https://doi.org/10.1103/physrevb.63.180506

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