Anisotropic Scattering Rates in the t-t'-U Hubbard Model

TL;DR

This paper studies how anisotropic scattering rates in the t-t'-U Hubbard model vary with doping and temperature, revealing implications for interpreting ARPES data in cuprate superconductors.

Contribution

It provides new insights into the anisotropic scattering phenomena near half-filling in the Hubbard model, linking theoretical predictions to experimental ARPES observations.

Findings

Strong anisotropic quasi-particle scattering near half-filling

Significant momentum-dependent variations in spectral functions

Relevance to photoemission spectra in cuprates

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. This behavior is quite in contrast to the intermediate doping regime and we discuss the possible relevance of our results for the interpretation of photoemission spectra in cuprate superconductors at different hole doping levels.