Diagonal Pad\'e Approximant of the one-body Green's function, a study on Hubbard rings
Strongly Correlated Electrons
2019-03-06 v1
Abstract
Pad\'e approximants to the many-body Green's function can be built by rearranging terms of its perturbative expansion. The hypothesis that the best use of a finite number of terms of such an expansion is given by the subclass of diagonal Pad\'e approximants is here tested, and largely confirmed, on a solvable model system, namely the Hubbard ring for a variety of site numbers, fillings and interaction strengths.
Cite
@article{arxiv.1902.00322,
title = {Diagonal Pad\'e Approximant of the one-body Green's function, a study on Hubbard rings},
author = {Walter Tarantino and Stefano Di Sabatino},
journal= {arXiv preprint arXiv:1902.00322},
year = {2019}
}