2008/03/31 by Long Dang, Long Van Dang, Massimo Boninsegni +1
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Physics of Superconductivity and Magnetism #Quantum, superfluid, helium dynamics #cond-mat.stat-mech
paper · pdf · doi:10.1103/physrevb.78.132512
published as Phys. Rev. B 78, 132512 (2008) · Replaced with published version
arxiv created 2008/10/29 · openalex publication_date 2008/10/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 \ensuremathρ<0.25. At filling \ensuremathρ>0.25, a supersolid phase exists between the star and the stripe crystal at \ensuremathρ=0.5. No supersolid phase occurs for \ensuremathρ>0.25 if the ground state at half-filling is either a checkerboard crystal or a superfluid. No commensurate supersolid phase is observed.