Quasi-equilibrium mixture of itinerant and localized bose atoms in optical lattice
V. I. YukalovBogolyubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow region, 141980, RussiaA. RakhimovInstitute of Nuclear Physics, Tashkent, 100214, UzbekistanS. MardonovSamarkand State University, Samarkand, Uzbekistan
ABI
Abstract
Conditions are studied under which there can exist a quasi-equilibrium mixture of itinerant and localized bosonic atoms in an optical lattice, even at zero temperature and at integer filling factor, when such a coexistence is impossible for an equilibrium lattice. The consideration is based on a model having the structure of a two-band, or two-component, boson Hubbard Hamiltonian. The minimal value for the ratio of onsite repulsion to tunneling parameter, necessary for the occurrence of such a mixture, is found.
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