title: Atomic Fermi gas in the trimerized kagomé lattice at 2/3 filling.
abstract: We study low temperature properties of a spinless interacting Fermi gas in the trimerized kagomé lattice. The case of two fermions per trimer is described by a quantum spin 1/2 model on the triangular lattice with couplings depending on the bond directions. Using exact diagonalizations we show that the system exhibits nonstandard properties of a quantum spin-liquid crystal, combining a planar antiferromagnetic order with an exceptionally large number of low-energy excitations.
authors.affiliation: Institut für Theoretische Physik, Universität Hannover, Appelstrasse 2, D-30167 Hannover, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Damski
authors.forename: H-U
authors.initials: HU
authors.lastname: Everts
authors.forename: A
authors.initials: A
authors.lastname: Honecker
authors.forename: H
authors.initials: H
authors.lastname: Fehrmann
authors.forename: L
authors.initials: L
authors.lastname: Santos
authors.forename: M
authors.initials: M
authors.lastname: Lewenstein