Exact localized eigenstates for an extended Bose-Hubbard model with pair-correlated hopping
Author(s): Peter Jason and Magnus Johansson
We show that a Bose-Hubbard model extended with pair-correlated hopping has exact eigenstates, quantum lattice compactons, with complete single-site localization. These appear at parameter values where the one-particle tunneling is exactly canceled by nonlocal pair correlations, and correspond in a …
[Phys. Rev. A 85, 011603] Published Thu Jan 05, 2012