Momentum structure of the self-energy and its parametrization for the two-dimensional Hubbard model

@article{Pudleiner2016MomentumSO,
title={Momentum structure of the self-energy and its parametrization for the two-dimensional Hubbard model},
author={P. Pudleiner and T. Schafer and D. Rost and Gang Li and K. Held and N. Blumer},
journal={Physical Review B},
year={2016},
volume={93},
pages={195134}
}

We compute the self-energy for the half-filled Hubbard model on a square lattice using lattice quantum Monte Carlo simulations and the dynamical vertex approximation. The self-energy is strongly momentum-dependent, but it can be parametrized via the noninteracting energy-momentum dispersion ${\ensuremath{\varepsilon}}_{\mathbf{k}}$, except for pseudogap features right at the Fermi edge. That is, it can be written as $\mathrm{\ensuremath{\Sigma}}({\ensuremath{\varepsilon}}_{\mathbf{k… CONTINUE READING