Journal
PHYSICAL REVIEW B
Volume 78, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.132512
Keywords
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Funding
- Natural Science and Engineering Research Council of Canada [G121210893]
- Alberta Informatics Circle of Research Excellence
- Swiss National Science Foundation
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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 rho < 0.25. At filling rho>0.25, a supersolid phase exists between the star and the stripe crystal at rho=0.5. No supersolid phase occurs for rho>0.25 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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