Simultaneous diagonal and off-diagonal order in the Bose-Hubbard Hamiltonian.

@article{Scalettar1995SimultaneousDA,
  title={Simultaneous diagonal and off-diagonal order in the Bose-Hubbard Hamiltonian.},
  author={Scalettar and Batrouni and Kampf and Zim{\'a}nyi},
  journal={Physical review. B, Condensed matter},
  year={1995},
  volume={51 13},
  pages={
          8467-8480
        }
}
The Bose-Hubbard model exhibits a rich phase diagram consisting both of insulating regimes where diagonal long-range (solid) order dominates as well as conducting regimes where off-diagonal long-range order (superfluidity) is present. In this paper we describe the results of quantum Monte Carlo calculations of the phase diagram, both for the hard- and soft-core cases, with a particular focus on the possibility of simultaneous superfluid and solid order. We also discuss the appearance of phase… 

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