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
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.
PACS: 74.72.-h – High-Tc compounds / 75.50.Ee – Antiferromagnetics / 79.60.-i – Photoemission and photoelectron spectra
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000