  We investigate the competing Fermi surface instabilities in the Kagome
tight-binding model. Specifically, we consider onsite and short-range Hubbard
interactions in the vicinity of van Hove filling of the dispersive Kagome bands
where the Fermiology promotes the joint effect of enlarged density of states
and nesting. The sublattice interference mechanism [Kiesel and Thomale, Phys.
Rev. B Rapid Comm., in press.] allows us to explain the intricate interplay
between ferromagnetic fluctuations and other ordering tendencies. On the basis
of functional renormalization group used to obtain an adequate low-energy
theory description, we discover finite angular momentum spin and charge density
wave order, a two-fold degenerate d-wave Pomeranchuk instability, and f-wave
superconductivity away from van Hove filling. Together, this makes the Kagome
Hubbard model the prototypical scenario for several unconventional Fermi
surface instabilities.
