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Reverse Rotation of Ring-Shaped Perturbation on Homogeneous Bose–Einstein Condensates |
| Peng Gao1,2, Zeyu Wu3, Zhan-Ying Yang1,2,4*, and Wen-Li Yang1,2,4,5 |
1School of Physics, Northwest University, Xi'an 710127, China
2Shaanxi Key Laboratory for Theoretical Physics Frontiers, Xi'an 710127, China
3Department of Physics and Astronomy, University College London, London WC1E 6BT, UK
4Peng Huanwu Center for Fundamental Theory, Xi'an 710127, China
5Institute of modern Physics, Northwest University, Xi'an 710127, China
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| Cite this article: |
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Peng Gao, Zeyu Wu, Zhan-Ying Yang et al 2021 Chin. Phys. Lett. 38 090302 |
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Abstract We numerically study the dynamics of rotating ring-shaped perturbation on two-dimensional homogeneous Bose–Einstein condensates, where a new ring-shaped structure with reverse rotation appears. The reversely rotating mode is directly caused by the existence of the plane wave (namely the homogeneous background). By the modified linear stability analysis method, we quantitatively predict the influence of the background's density on perturbation dynamics, including the velocity, amplitude, and frequency of the two rings. We construct an approximative solution to describe the short-lived dynamics of initial perturbation, which agrees well with our numerical results. Also, after the two rings separate, the transfer of atom number between them becomes linear, and the rate of transfer is impacted by the radial momentum of initial perturbation.
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Received: 27 June 2021
Published: 02 September 2021
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| PACS: |
03.75.Kk
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(Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow)
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03.75.Lm
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(Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)
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05.45.-a
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(Nonlinear dynamics and chaos)
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| Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11875220 and 12047502). |
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