Boninsegni Massimo, Prokof'ev Nikolay
Department of Physics, University of Alberta, Edmonton, Alberta T6G 2J1, Canada.
Phys Rev Lett. 2005 Dec 2;95(23):237204. doi: 10.1103/PhysRevLett.95.237204. Epub 2005 Nov 28.
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, -m, -m) 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.
