Journal
JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
Volume 104, Issue 2, Pages 230-244Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1063776107020082
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A microscopic theory for the electron spectrum of the CuO2 plane within an effective p-d Hubbard model is proposed. The Dyson equation for the single-electron Green's function in terms of the Hubbard operators is derived and solved self-consistently for the self-energy evaluated in the noncrossing approximation. Electron scattering on spin fluctuations induced by the kinematic interaction is described by a dynamical spin susceptibility with a continuous spectrum. The doping and temperature dependence of electron dispersions, spectral functions, the Fermi surface, and the coupling constant lambda are studied in the hole-doped case. At low doping, an arc-type Fermi surface and a pseudogap in the spectral function close to the Brillouin zone boundary are observed.
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