title: Unconventional fermi surface instabilities in the kagome Hubbard model.
abstract: We investigate the competing Fermi surface instabilities in the kagome tight-binding model. Specifically, we consider on-site 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 devised by Kiesel and Thomale [Phys. Rev. B 86, 121105 (2012)] allows us to explain the intricate interplay between ferromagnetic fluctuations and other ordering tendencies. On the basis of the functional renormalization group used to obtain an adequate low-energy theory description, we discover finite angular momentum spin and charge density wave order, a twofold 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.
authors.affiliation: Institute for Theoretical Physics, University of Würzburg, Am Hubland, D 97074 Würzburg, Germany.
authors.forename: Maximilian L
authors.initials: ML
authors.lastname: Kiesel
authors.affiliation: Institute for Theoretical Physics, University of Würzburg, Am Hubland, D 97074 Würzburg, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Platt
authors.affiliation: Institute for Theoretical Physics, University of Würzburg, Am Hubland, D 97074 Würzburg, Germany and Institut de théorie des phénomènes physiques, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
authors.forename: Ronny
authors.initials: R
authors.lastname: Thomale
mesh_terms: D004583:Electrons; D008962:Models, Theoretical; D013499:Surface Properties