First and second sound in a compressible 3D bose fluid
The two-fluid model is fundamental for the description of superfluidity. In the nearly incompressible liquid regime, it successfully describes first and second sound, corresponding, respectively, to density and entropy waves, in both liquid helium and unitary Fermi gases. Here, we study the two soun...
| Asıl Yazarlar: | , , , , , |
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| Materyal Türü: | Journal article |
| Dil: | English |
| Baskı/Yayın Bilgisi: |
American Physical Society
2022
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| _version_ | 1826309109062828032 |
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| author | Hilker, TA Dogra, LH Eigen, C Glidden, JAP Smith, RP Hadzibabic, Z |
| author_facet | Hilker, TA Dogra, LH Eigen, C Glidden, JAP Smith, RP Hadzibabic, Z |
| author_sort | Hilker, TA |
| collection | OXFORD |
| description | The two-fluid model is fundamental for the description of superfluidity. In the nearly incompressible liquid regime, it successfully describes first and second sound, corresponding, respectively, to density and entropy waves, in both liquid helium and unitary Fermi gases. Here, we study the two sounds in the opposite regime of a highly compressible fluid, using an ultracold <sup>39</sup>K Bose gas in a three-dimensional box trap. We excite the longest-wavelength mode of our homogeneous gas, and observe two distinct resonant oscillations below the critical temperature, of which only one persists above it. In a microscopic mode-structure analysis, we find agreement with the hydrodynamic theory, where first and second sound involve density oscillations dominated by, respectively, thermal and condensed atoms. Varying the interaction strength, we explore the crossover from hydrodynamic to collisionless behavior in a normal gas. |
| first_indexed | 2024-03-07T07:29:17Z |
| format | Journal article |
| id | oxford-uuid:b2d254f6-2bcc-4bbe-a22e-7965e1fa90fb |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:29:17Z |
| publishDate | 2022 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:b2d254f6-2bcc-4bbe-a22e-7965e1fa90fb2023-01-04T14:21:11ZFirst and second sound in a compressible 3D bose fluidJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b2d254f6-2bcc-4bbe-a22e-7965e1fa90fbEnglishSymplectic ElementsAmerican Physical Society2022Hilker, TADogra, LHEigen, CGlidden, JAPSmith, RPHadzibabic, ZThe two-fluid model is fundamental for the description of superfluidity. In the nearly incompressible liquid regime, it successfully describes first and second sound, corresponding, respectively, to density and entropy waves, in both liquid helium and unitary Fermi gases. Here, we study the two sounds in the opposite regime of a highly compressible fluid, using an ultracold <sup>39</sup>K Bose gas in a three-dimensional box trap. We excite the longest-wavelength mode of our homogeneous gas, and observe two distinct resonant oscillations below the critical temperature, of which only one persists above it. In a microscopic mode-structure analysis, we find agreement with the hydrodynamic theory, where first and second sound involve density oscillations dominated by, respectively, thermal and condensed atoms. Varying the interaction strength, we explore the crossover from hydrodynamic to collisionless behavior in a normal gas. |
| spellingShingle | Hilker, TA Dogra, LH Eigen, C Glidden, JAP Smith, RP Hadzibabic, Z First and second sound in a compressible 3D bose fluid |
| title | First and second sound in a compressible 3D bose fluid |
| title_full | First and second sound in a compressible 3D bose fluid |
| title_fullStr | First and second sound in a compressible 3D bose fluid |
| title_full_unstemmed | First and second sound in a compressible 3D bose fluid |
| title_short | First and second sound in a compressible 3D bose fluid |
| title_sort | first and second sound in a compressible 3d bose fluid |
| work_keys_str_mv | AT hilkerta firstandsecondsoundinacompressible3dbosefluid AT dogralh firstandsecondsoundinacompressible3dbosefluid AT eigenc firstandsecondsoundinacompressible3dbosefluid AT gliddenjap firstandsecondsoundinacompressible3dbosefluid AT smithrp firstandsecondsoundinacompressible3dbosefluid AT hadzibabicz firstandsecondsoundinacompressible3dbosefluid |