2000/11/30 by P. Prelovšek, P. Prelovsek, A. Ramšak +1 · 17 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Brillouin zone #Condensed matter physics #Coupling (piping) #Cuprate #Doping #Materials science #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Quantum and electron transport phenomena #Quasiparticle #Spin (aerodynamics) #Superconductivity #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.63.180506
published in Physical review. B, Condensed matter 63(18) (American Physical Society) · Minor corrections; to appear in Phys. Rev. B (RC)
arxiv created 2001/02/28 · openalex publication_date 2001/04/06 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We calculate spectral functions within the t\ensuremath-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, which at low doping effectively truncates the Fermi surface, in particular near the (\ensuremathπ,0) point in the Brillouin zone.