We study the electronic phases of the kagome Hubbard model (KHM) in the weak coupling limit around van Hove filling. Through an analytic renormalization group analysis, we find that there exists a sublattice interference mechanism where the kagome sublattice structure affects the character of the Fermi surface instabilities. It leads to major suppression of Tc for d+id superconductivity in the KHM and causes an anomalous increase of Tc upon addition of longer-range Hubbard interactions. We conjecture that the suppression of conventional Fermi liquid instabilities makes the KHM a prototype candidate for hosting exotic electronic states of matter at intermediate coupling.
@article{arxiv.1206.6539,
title = {Sublattice Interference in the Kagome Hubbard Model},
author = {Maximilian Kiesel and Ronny Thomale},
journal= {arXiv preprint arXiv:1206.6539},
year = {2015}
}