ZhETF, Vol. 131,
p. 259 (February 2007)
(English translation - JETP,
Vol. 104, No. 2,
available online at www.springer.com
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
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.