The doping dependence of the Fermi surface and energy distribution curves of the high-T_C cuprate materials La_(2-x)Sr _xCuO_4 and Bi_2Sr_2CaCu _2O_(8+δ) are analyzed within the rotating antiferromagnetism theory. Using three different quantities; the k-dependent occupation probability, the spectral function, and the chemical potential (energy spectra), the Fermi surface is calculated and compared to experimental data for La_(2-x)Sr_x CuO_4 The Fermi surface we calculate evolves from hole-like pockets in the underdoped regime to large electron-like contours in the overdoped regime. This is in agreement with recent findings by Sebastian et al for the α-pocket of YBa_2Cu _3O_(6+x) (2010 Phys. Rev. B 81 214524). In addition, the full width at half maximum of the energy distribution curves is found to behave linearly with their peak position in agreement with experiment for Bi _2Sr_2CaCu_2O_(8+δ). The effect of scattering on both the Fermi surface and energy distribution curves is examined.
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