title: Quantum Paramagnet in a π Flux Triangular Lattice Hubbard Model.
abstract: We propose the π flux triangular lattice Hubbard model (π THM) as a prototypical setup to stabilize magnetically disordered quantum states of matter in the presence of charge fluctuations. The quantum paramagnetic domain of the π THM that we identify for intermediate Hubbard U is framed by a Dirac semimetal for weak coupling and by 120° Néel order for strong coupling. Generalizing the Klein duality from spin Hamiltonians to tight-binding models, the π THM maps to a Hubbard model which corresponds to the (J_{H},J_{K})=(-1,2) Heisenberg-Kitaev model in its strong coupling limit. The π THM provides a promising microscopic testing ground for exotic finite-U spin liquid ground states amenable to numerical investigation.
authors.affiliation: Institute for Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany.
authors.forename: Stephan
authors.initials: S
authors.lastname: Rachel
authors.affiliation: Institute for Theoretical Physics, University of Würzburg, 97074 Würzburg, Germany.
authors.forename: Manuel
authors.initials: M
authors.lastname: Laubach
authors.affiliation: Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany.|Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany.
authors.forename: Johannes
authors.initials: J
authors.lastname: Reuther
authors.affiliation: Institute for Theoretical Physics, University of Würzburg, 97074 Würzburg, Germany.
authors.forename: Ronny
authors.initials: R
authors.lastname: Thomale