Quasiequilibrium 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, RussiaAbdulla RakhimovInstitute of Nuclear Physics, Tashkent, 100214, UzbekistanSh. MardonovSamarkand State University, Samarkand, Uzbekistan
2016en
ABI
Annotatsiya
Conditions are studied under which there can exist a quasiequilibrium 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 on-site repulsion to tunneling parameter, necessary for the occurrence of such a mixture, is found.
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