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Supersolid Phase of Hard-Core Bosons on a Triangular Lattice

2005; American Physical Society; Volume: 95; Issue: 23 Linguagem: Inglês

10.1103/physrevlett.95.237204

1092-0145

Massimo Boninsegni, Nikolay Prokof’ev,

Physics of Superconductivity and Magnetism

We study properties of the supersolid phase observed for hard-core bosons on the triangular lattice near half-integer filling factor, and the phase diagram of the system at finite temperature. We find that the solid order is always of the $(2m,\ensuremath{-}{m}^{\ensuremath{'}},\ensuremath{-}{m}^{\ensuremath{'}})$ with $m$ changing discontinuously from positive to negative values at half filling, in contrast with phases observed for Ising spins in a transverse magnetic field. At finite temperature we find two intersecting second-order transition lines: one in the 3-state Potts universality class and the other of the Kosterlitz-Thouless type.