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Superfluid drag in the two-component Bose-Hubbard model
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics, Statistical Physics.
2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 9, article id 094517Article in journal (Refereed) Published
Abstract [en]

In multicomponent superfluids and superconductors, co- and counterflows of components have, in general, different properties. A. F. Andreev and E. P. Bashkin [Sov. Phys. JETP 42, 164 (1975)] discussed, in the context of He-3/He-4 superfluid mixtures, that interparticle interactions produce a dissipationless drag. The drag can be understood as a superflow of one component induced by phase gradients of the other component. Importantly, the drag can be both positive (entrainment) and negative (counterflow). The effect is known to have crucial importance for many properties of diverse physical systems ranging from the dynamics of neutron stars and rotational responses of Bose mixtures of ultracold atoms to magnetic responses of multicomponent superconductors. Although substantial literature exists that includes the drag interaction phenomenologically, only a few regimes are covered by quantitative studies of the microscopic origin of the drag and its dependence on microscopic parameters. Here we study the microscopic origin and strength of the drag interaction in a quantum system of two-component bosons on a latticewith short-range interaction. By performing quantum Monte Carlo simulations of a two-component Bose-Hubbard model we obtain dependencies of the drag strength on the boson-boson interactions and properties of the optical lattice. Of particular interest are the strongly correlated regimes where the ratio of coflow and counterflow superfluid stiffnesses can diverge, corresponding to the case of saturated drag.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 97, no 9, article id 094517
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-226202DOI: 10.1103/PhysRevB.97.094517ISI: 000428775400007Scopus ID: 2-s2.0-85044728518OAI: oai:DiVA.org:kth-226202DiVA, id: diva2:1209228
Note

QC 20180522

Available from: 2018-05-22 Created: 2018-05-22 Last updated: 2018-11-23Bibliographically approved

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Sellin, KarlBabaev, Egor

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