  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.
