title: Phase diagram of the triangular extended Hubbard model.
abstract: We study the extended Hubbard model on the triangular lattice as a function of filling and interaction strength. The complex interplay of kinetic frustration and strong interactions on the triangular lattice leads to exotic phases where long-range charge order, antiferromagnetic order, and metallic conductivity can coexist. Variational Monte Carlo simulations show that three kinds of ordered metallic states are stable as a function of nearest neighbor interaction and filling. The coexistence of conductivity and order is explained by a separation into two functional classes of particles: part of them contributes to the stable order, while the other part forms a partially filled band on the remaining substructure. The relation to charge ordering in charge transfer salts is discussed.
authors.affiliation: Institute for Theoretical Physics, University of Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt, Germany and CNR-IOM-Democritos National Simulation Centre and International School for Advanced Studies (SISSA), Via Bonomea 265, I-34136 Trieste, Italy.
authors.forename: Luca F
authors.initials: LF
authors.lastname: Tocchio
authors.affiliation: Institute for Theoretical Physics, University of Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt, Germany.
authors.forename: Claudius
authors.initials: C
authors.lastname: Gros
authors.affiliation: Physics Department and Research Center OPTIMAS, University of Kaiserslautern, D-67663 Kaiserslautern, Germany.
authors.forename: Xue-Feng
authors.initials: XF
authors.lastname: Zhang
authors.affiliation: Physics Department and Research Center OPTIMAS, University of Kaiserslautern, D-67663 Kaiserslautern, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Eggert