Pseudogap and the Fermi surface in the t-J model |
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Authors: | A Ramšak P Prelovšek |
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Institution: | a Faculty of Mathematics and Physics, University of Ljubljana, 1001 Ljubljana, Slovenia b J. Stefan Institute, University of Ljubljana, 1001 Ljubljana, Slovenia |
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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 self-consistent 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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Keywords: | D Fermi surface |
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