Charge gaps at fractional fillings in boson Hubbard ladders

@article{Ying2014ChargeGA,
  title={Charge gaps at fractional fillings in boson Hubbard ladders},
  author={Tao Ying and G. G. Batrouni and Guixin Tang and X. D. Sun and Richard T. Scalettar},
  journal={Physical Review B},
  year={2014},
  volume={89},
  pages={195128}
}
The Bose-Hubbard Hamiltonian describes the competition between superfluidity and Mott insulating behavior at zero temperature and commensurate filling as the strength of the on-site repulsion is varied. Gapped insulating phases also occur at non-integer densities as a consequence of longer ranged repulsive interactions. In this paper we explore the formation of gapped phases in coupled chains due instead to anisotropies $t_x \neq t_y$ in the bosonic hopping, extending the work of Crepin {\it et… 
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