Andreev–Bashkin effect in superfluid cold gases mixtures
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 rel...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2017-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/aa93a0 |
| _version_ | 1797750749704224768 |
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| author | Jacopo Nespolo Grigori E Astrakharchik Alessio Recati |
| author_facet | Jacopo Nespolo Grigori E Astrakharchik Alessio Recati |
| author_sort | Jacopo Nespolo |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-12T16:37:22Z |
| format | Article |
| id | doaj.art-530d128e10d144d4b9155c82a7cc44aa |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:37:22Z |
| publishDate | 2017-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-530d128e10d144d4b9155c82a7cc44aa2023-08-08T14:48:33ZengIOP PublishingNew Journal of Physics1367-26302017-01-01191212500510.1088/1367-2630/aa93a0Andreev–Bashkin effect in superfluid cold gases mixturesJacopo Nespolo0Grigori E Astrakharchik1Alessio Recati2Department of Physics, Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München , Theresienstraße 37, D-80333 Munich, GermanyDepartament de Física, Universitat Politècnica de Catalunya , E-08034 Barcelona, SpainDepartment of Physics, Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München , Theresienstraße 37, D-80333 Munich, Germany; INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento , Via Sommarive 14, I-38123 Povo, ItalyWe 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.https://doi.org/10.1088/1367-2630/aa93a0multicomponent superfluidsAndreev–Bashkin effectdipolar gasesdiffusion quantum Monte Carlosum rules |
| spellingShingle | Jacopo Nespolo Grigori E Astrakharchik Alessio Recati Andreev–Bashkin effect in superfluid cold gases mixtures New Journal of Physics multicomponent superfluids Andreev–Bashkin effect dipolar gases diffusion quantum Monte Carlo sum rules |
| title | Andreev–Bashkin effect in superfluid cold gases mixtures |
| title_full | Andreev–Bashkin effect in superfluid cold gases mixtures |
| title_fullStr | Andreev–Bashkin effect in superfluid cold gases mixtures |
| title_full_unstemmed | Andreev–Bashkin effect in superfluid cold gases mixtures |
| title_short | Andreev–Bashkin effect in superfluid cold gases mixtures |
| title_sort | andreev bashkin effect in superfluid cold gases mixtures |
| topic | multicomponent superfluids Andreev–Bashkin effect dipolar gases diffusion quantum Monte Carlo sum rules |
| url | https://doi.org/10.1088/1367-2630/aa93a0 |
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