title: Extended supersolid phase of frustrated hard-core bosons on a triangular lattice.
abstract: We study a model of hard-core bosons with frustrated nearest-neighbor hopping (t) and repulsion (V) on the triangular lattice. We argue for a supersolid ground state in the large repulsion (V>>|t|) limit where a dimer representation applies, by constructing a unitary mapping to the well-understood unfrustrated hopping case. This generalized "Marshall sign rule" allows us to establish the precise nature of the supersolid order by utilizing a recently proposed dimer variational wave function, whose correlations can be efficiently calculated using the Grassmann approach. By continuity, a supersolid is predicted over the wide parameter range, V>-2t>0. This also establishes a simple phase diagram for the triangular lattice spin 1/2 XXZ antiferromagnet.
authors.affiliation: Department of Physics, University of California, Berkeley, California 94720, USA.
authors.forename: Fa
authors.initials: F
authors.lastname: Wang
authors.forename: Frank
authors.initials: F
authors.lastname: Pollmann
authors.forename: Ashvin
authors.initials: A
authors.lastname: Vishwanath