| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Hydrodynamics of a Multi-Component Bosonic Superfluid |
| Fan Zhang and Lan Yin* |
| School of Physics, Peking University, Beijing 100871, China |
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| Cite this article: |
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Fan Zhang and Lan Yin 2023 Chin. Phys. Lett. 40 066701 |
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Abstract We obtain the superfluid hydrodynamic equations of a multi-component Bose gas with short-ranged interactions at zero temperature under the local equilibrium assumption and show that the quantum pressure is generally present in the nonuniform case. Our approach can be extended to systems with long-range interactions such as dipole-dipole interactions by treating the Hartree energy properly. For a highly symmetric superfluid, we obtain the excitation spectrum and show that except for the density phonon, all other excitations are all degenerate. The implication of our results is discussed.
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Received: 18 March 2023
Editors' Suggestion
Published: 16 May 2023
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| PACS: |
05.30.Jp
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(Boson systems)
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47.37.+q
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(Hydrodynamic aspects of superfluidity; quantum fluids)
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67.85.Pq
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(Mixtures of Bose and Fermi gases)
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03.75.Kk
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(Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow)
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