Abstract
We study a model of hard-core bosons with frustrated nearest-neighbor hopping () and repulsion () on the triangular lattice. We argue for a supersolid ground state in the large repulsion () 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, . This also establishes a simple phase diagram for the triangular lattice spin antiferromagnet.
- Received 18 September 2008
DOI:https://doi.org/10.1103/PhysRevLett.102.017203
©2009 American Physical Society