Quasi-particle functional Renormalisation Group calculations in the two-dimensional t-t'-Hubbard model
Strongly Correlated Electrons
2023-11-15 v2 High Energy Physics - Theory
Abstract
We extend and apply a recently introduced quasi-particle functional renormalisation group scheme to the two-dimensional Hubbard model with next-nearest-neighbour hopping and away from half filling. We confirm the generation of superconducting correlations in some regions of the phase diagram, but also find that the inclusion of self-energy feedback by means of a decreasing quasi-particle weight can suppress superconducting tendencies more than anti-ferromagnetic correlations by which they are generated. As a supplement, we provide sample results for the self-energy in second-order perturbation theory and address some conceptual matters.
Keywords
Cite
@article{arxiv.2304.09001,
title = {Quasi-particle functional Renormalisation Group calculations in the two-dimensional t-t'-Hubbard model},
author = {Daniel Rohe},
journal= {arXiv preprint arXiv:2304.09001},
year = {2023}
}