ELECTRON SPECTRUM IN HIGH-TEMPERATURE CUPRATE SUPERCONDUCTORS
Plakida N.M., Oudovenko V.S.

Received: July 7, 2006

PACS: 74.20.Mn, 71.27.+a, 71.10.Fd, 74.72.-h

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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 λ 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.