Supersolids versus phase separation in two-dimensional lattice bosons

Details Supersolids versus phase separation in two-dimensional lattice bosons Supersolids versus phase separation in two-dimensional lattice bosons

2004-12-14

arxiv.org/abs/cond-mat/0412338v1

Phys. Rev. Lett. 94, 207202 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 p., 5 eps figures

Scientific paper

10.1103/PhysRevLett.94.207202

We study the nature of the ground state of the strongly-coupled two dimensional extended boson Hubbard model on a square lattice. 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 just above half-filling, and that the checker-board crystal is unstable for smaller V, and for any V just below half-filling. The interplay between these two interaction energies results in a rich phase diagram which is studied in detail using quantum Monte Carlo methods.

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