Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 7, Pages 1599-1602Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.1599
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We study quantum phase transitions in the ground state of the two dimensional hard-core boson Hubbard Hamiltonian. Recent work on this and related models has suggested supersolid phases with simultaneous diagonal and off-diagonal long range order. We show numerically that, contrary to the generally held belief, the most commonly discussed checkerboard supersolid is thermodynamically unstable. Furthermore, this supersolid cannot be stabilized by next-near-neighbor interaction. We obtain the correct phase diagram using the Maxwell construction. We demonstrate that the striped supersolid is thermodynamically stable and is separated from the superfluid phase by a continuous phase transition.
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