SCALETTAR , R. T.

We present results of Quantum Monte Carlo simulations for the soft core extended bosonic Hubbard model in one dimension. By studying the superfluid density, the compressibility and the structure factor, we show that, contrary to previous claims, supersolid phases are present, similar to those recently shown to exist in two dimensions. We find...

We present Quantum Monte Carlo simulations of the soft-core bosonic Hubbard model with a ring exchange term K. For values of K which exceed roughly half the on-site repulsion U, the density is a non-monotonic function of the chemical potential, indicating that the system has a tendency to phase separate. This behavior is confirmed by an...