Vacancy supersolid of hard-core bosons on the square lattice

Details Vacancy supersolid of hard-core bosons on the square lattice Vacancy supersolid of hard-core bosons on the square lattice

2008-03-07

arxiv.org/abs/0803.1116v2

Phys. Rev. B 78, 132512 (2008)

Physics

Condensed Matter

Statistical Mechanics

Replaced with published version

Scientific paper

10.1103/PhysRevB.78.132512

The ground state of hard-core bosons on the square lattice with nearest and next-nearest neighbor repulsion is studied by Quantum Monte Carlo simulations. A supersolid phase with vacancy condensation and 'star' diagonal ordering is found for filling less than a quarter. At fillings above one quarter, a supersolid phase exists between the star and the stripe crystal at half-filling. No supersolid phase occurs above quarter-filling, if the ground state at half-filling is either a checkerboard crystal or a superfluid. No commensurate supersolid phase is observed.

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