Supersolids versus phase separation in two-dimensional lattice bosons

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 supers...

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Bibliographic Details
Published inPhysical review letters Vol. 94; no. 20; p. 207202
Main Authors Sengupta, Pinaki, Pryadko, Leonid P, Alet, Fabien, Troyer, Matthias, Schmid, Guido
Format Journal Article
LanguageEnglish
Published United States 27.05.2005
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.94.207202