Matrix element interference in $N$-patch functional renormalization group
Strongly Correlated Electrons
2019-04-10 v1
Abstract
We show that the N-patch functional renormalization group (pFRG), a theoretical method commonly applied for correlated electron systems, is unable to implement consistently the matrix element interference arising from strong momentum dependence in the Bloch state contents or the interaction vertices. We show that such a deficit could lead to results incompatible with checkable limits of weak and strong coupling. We propose that the pFRG could be improved by a better account of momentum conservation.
Cite
@article{arxiv.1904.02029,
title = {Matrix element interference in $N$-patch functional renormalization group},
author = {Li-Han Chen and Zhen Liu and Jian-Ting Zheng},
journal= {arXiv preprint arXiv:1904.02029},
year = {2019}
}
Comments
5 pages, 3 figures