Eur. Phys. J. B 18, 429-433 (2000)
https://doi.org/10.1007/s100510070029

Anisotropic scattering rates and antiferromagnetic precursor effects in the t-t'-U Hubbard model

¹ Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
² Institut für Theoretische Physik, Technische Universität Braunschweig, 38106 Braunschweig, Germany
³ Institut für Physik, Theoretische Physik III, Universität Augsburg, 86135 Augsburg, Germany

Corresponding author: ^a kampfa@physik.uni-augsburg.de

Received: 31 July 2000
Published online: 15 December 2000

Abstract

We have investigated the evolution of the electronic properties of the t-t'-U Hubbard model with hole doping and temperature. Due to the shape of the Fermi surface, scattering from short wavelength spin fluctuations leads to strongly anisotropic quasi-particle scattering rates at low temperatures near half-filling. As a consequence, significant variations with momenta near the Fermi surface emerge for the spectral functions and the corresponding ARPES signals. At low doping the inverse lifetime of quasiparticles on the Fermi surface is of order varying linearly in temperature from energies of order t down to a very low energy scale set by the spin fluctuation frequency while at intermediate doping a sub-linear T-dependence is observed. This behavior is possibly relevant for the interpretation of photoemission spectra in cuprate superconductors at different hole doping levels.