Superconductor–Mott-insulator transition in Bose systems with finite-range interactions
- 1 January 1993
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 47 (1), 342-347
- https://doi.org/10.1103/physrevb.47.342
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.Keywords
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