Exact localized eigenstates for an extended Bose-Hubbard model with pair-correlated hopping
2012 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 85, no 1, 016603(R)- p.Article in journal (Refereed) Published
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 classical limit to compact solutions of an extended discrete nonlinear Schrödinger model. Classical compactons at other parameter values, as well as multisite compactons, generically get delocalized by quantum effects, but strong localization appears asymptotically for increasing particle number.
Place, publisher, year, edition, pages
American Physical Society , 2012. Vol. 85, no 1, 016603(R)- p.
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:liu:diva-73926DOI: 10.1103/PhysRevA.85.011603ISI: 000298861100001OAI: oai:DiVA.org:liu-73926DiVA: diva2:478700
Funding agencies|Swedish Research Council||2012-01-162012-01-162016-08-22