Strong-coupling expansion for the two-species Bose-Hubbard model

  title={Strong-coupling expansion for the two-species Bose-Hubbard model},
  author={M. Iskin},
  journal={Physical Review A},
  • M. Iskin
  • Published 30 December 2009
  • Physics
  • Physical Review A
To analyze the ground-state phase diagram of Bose-Bose mixtures loaded into d-dimensional hypercubic optical lattices, we perform a strong-coupling power-series expansion in the kinetic energy term (plus a scaling analysis) for the two-species Bose-Hubbard model with onsite boson-boson interactions. We consider both repulsive and attractive interspecies interaction, and obtain an analytical expression for the phase boundary between the incompressible Mott insulator and the compressible… 

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Tao Wang ( ),1,2 Xue-Feng Zhang ( ),3,2,4,* Chun-Feng Hou,5 Sebastian Eggert,2 and Axel Pelster2 1School of Science, Wuhan Institute of Technology, 438000 Wuhan, China 2Physics Department and