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arxiv: cond-mat/9404042 · v1 · submitted 1994-04-14 · ❄️ cond-mat

Supersolids in the Bose-Hubbard Hamiltonian

classification ❄️ cond-mat
keywords hamiltonianinteractionsnear--neighborphaserangesolidsuperfluidityanalytic
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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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