Superconductor–Mott-insulator transition in Bose systems with finite-range interactions
C. Bruder, Rosario Fazio, Gerd Schön
DOI 10.1103/PhysRevB.47.342 · Physical Review B
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Abstract
We study the superconductor-insulator transition of Bose-Hubbard models with finite-range interactions. Commensurability of the charge distribution with the underlying lattice leads to a richly structured phase diagram. In addition to the lobes of insulating phase characterized by integer fillings, we find–for finite-range interactions–lobes with rational filling factors. At low temperatures we can investigate the phase transition by mapping the model onto a XXZ spin-1/2 Heisenberg model.
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