Phys. Rev. Lett. 94, 207202 (2005) [4 pages]Supersolids versus Phase Separation in Two-Dimensional Lattice BosonsReceived 15 December 2004; published 23 May 2005 We study the nature of the ground state of the two-dimensional extended boson Hubbard model on a square lattice by quantum Monte Carlo methods. We demonstrate that strong but finite on-site interaction U along with a comparable nearest-neighbor repulsion V result in a thermodynamically stable supersolid ground state for densities larger than 1/2, in contrast to fillings less than 1/2 or for very large U, where the checkerboard supersolid is unstable towards phase separation. We discuss the relevance of our results to realizations of supersolids using cold bosonic atoms in optical lattices. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.207202
DOI:
10.1103/PhysRevLett.94.207202
PACS:
75.40.Gb, 75.10.Jm, 75.30.Ds, 75.40.Mg
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