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dc.contributor.authorNespolo, Jacopo
dc.contributor.authorAstrakharchik, Grigori
dc.contributor.authorRecati, Alessio
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.identifier.citationNespolo, J., Astrakharchik, G., Recati, A. Andreev-Bashkin effect in superfluid cold gases mixtures. "New journal of physics", 5 Desembre 2017, vol. 19, p. 1-12.
dc.description.abstract© 2017 The Author(s). Published by IOP Publishing Ltd on behalf of Deutsche Physikalische Gesellschaft. We study a mixture of two superfluids with density-density and current-current (Andreev-Bashkin) interspecies interactions. The Andreev-Bashkin coupling gives rise to a dissipationless drag (or entrainment) between the two superfluids. Within the quantum hydrodynamics approximation, we study the relations between speeds of sound, susceptibilities and static structure factors, in a generic model in which the density and spin dynamics decouple. Due to translational invariance, the density channel does not feel the drag. The spin channel, instead, does not satisfy the usual Bijl-Feynman relation, since the f-sum rule is not exhausted by the spin phonons. The very same effect on one dimensional Bose mixtures and their Luttinger liquid description is analysed within perturbation theory. Using diffusion quantum Monte Carlo simulations of a system of dipolar gases in a double layer configuration, we confirm the general results. Given the recent advances in measuring the counterflow instability, we also study the effect of the entrainment on the dynamical stability of a superfluid mixture with non-zero relative velocity.
dc.format.extent12 p.
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.subjectÀrees temàtiques de la UPC::Física
dc.subject.lcshSum rules (Physics)
dc.subject.lcshMonte Carlo method
dc.subject.otherAndreev-Bashkin effect
dc.subject.otherdiffusion quantum Monte Carlo
dc.subject.otherdipolar gases
dc.subject.othermulticomponent superfluids
dc.subject.othersum rules
dc.titleAndreev-Bashkin effect in superfluid cold gases mixtures
dc.subject.lemacMontecarlo, Mètode de
dc.contributor.groupUniversitat Politècnica de Catalunya. SIMCON - First-principles approaches to condensed matter physics: quantum effects and complexity
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
local.citation.authorNespolo, J.; Astrakharchik, G.; Recati, A.
local.citation.publicationNameNew journal of physics

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