Spectral functions and pseudogap in the t-J model

Details Spectral functions and pseudogap in the t-J model Spectral functions and pseudogap in the t-J model

2000-11-06

arxiv.org/abs/cond-mat/0011089v2

Phys. Rev. B, 63 (2001) 180506(R)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevB.63.180506

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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