Spectral functions and pseudogap in the t-J model

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.

Minor corrections; to appear in Phys. Rev. B (RC)

References in corpus (1)

• On Pseudogaps in One-Dimensional Models with Quasi-Long-Ranged-Order

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• Electronic spectrum and superconductivity in the extended t-J-V model
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