Mott transition in lattice boson models
arXiv:math-ph/0509060 · doi:10.1007/s00220-006-0038-9
Abstract
We use mathematically rigorous perturbation theory to study the transition between the Mott insulator and the conjectured Bose-Einstein condensate in a hard-core Bose-Hubbard model. The critical line is established to lowest order in the tunneling amplitude.
20 pages