Supersolids in the Bose-Hubbard Hamiltonian

Details Supersolids in the Bose-Hubbard Hamiltonian Supersolids in the Bose-Hubbard Hamiltonian

1994-04-14

arxiv.org/abs/cond-mat/9404042v1

Physics

Condensed Matter

11 pages, Revtex 3.0, 6 figures (upon request)

Scientific paper

10.1103/PhysRevLett.74.2527

We use a combination of numeric and analytic techniques to determine the groun d state phase diagram of the Bose--Hubbard Hamiltonian with longer range repulsi ve interactions. At half filling one finds superfluidity and an insulating solid phase. Depending on the relative sizes of near--neighbor and next near--neighbor interactions, this solid either follows a checkerboard or a striped pattern. In neither case is there a coexistence with superfluidity. However upon doping ``supersolid'' phases appear with simultaneous diagonal and off--diagonal long range order.

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