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Solitonic Diffusion of Wavepackets in One-Dimensional Bose–Einstein Condensates |
| Yu Mo, Cong Zhang, Shiping Feng, Shi-Jie Yang** |
Department of Physics, Beijing Normal University, Beijing 100875
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| Cite this article: |
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Yu Mo, Cong Zhang, Shiping Feng et al 2019 Chin. Phys. Lett. 36 120301 |
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Abstract Solitonic characteristics are revealed in the diffusion process of a hump or a notch wave packet in a one-dimensional Bose–Einstein condensate. By numerically solving the time-dependent Gross–Pitaevskii equation, we find completely different spreading behavior for attractive or repulsive condensates. For the attractive condensate, a series of bright solitons are continuously generated one after another at the wave front and they nearly stay at the positions where they are generated in the whole diffusion process. In contrast, for the repulsive condensate, the initial wave packet splits at the beginning into a series of grey solitons that travel at different velocities. The moving velocity of the grey soliton depends on nonlinear interaction strength, as well as the shape of a particular grey soliton.
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Received: 28 July 2019
Published: 25 November 2019
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| PACS: |
03.75.Mn
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(Multicomponent condensates; spinor condensates)
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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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05.30.Jp
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(Boson systems)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11774034 and 11734002. |
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