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Moving Matter-Wave Solitons in Spin–Orbit Coupled Bose–Einstein Condensates |
| Yu-E Li, Ju-Kui Xue** |
Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronics Engineering, Northwest Normal University, Lanzhou 730070
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| Cite this article: |
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Yu-E Li, Ju-Kui Xue 2016 Chin. Phys. Lett. 33 100502 |
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Abstract We investigate the moving matter-wave solitons in spin–orbit coupled Bose–Einstein condensates (BECs) by a perturbation method. Starting with the one-dimensional Gross–Pitaevskii equations, we derive a new KdV-like equation to which an approximate solution is obtained by assuming weak Raman coupling and strong spin–orbit coupling. The derivation of the KdV-like equation may be useful to understand the properties of solitons excitation in spin–orbit coupled BECs. We find different types of moving solitons: dark–bright, bright–bright and dark–dark solitons. Interestingly, moving dark–dark soliton for attractive intra- and inter-species interactions is found, which depends on the Raman coupling. The amplitude and velocity of the moving solitons strongly depend on the Raman coupling and spin–orbit coupling.
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Received: 24 July 2016
Published: 27 October 2016
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| PACS: |
05.45.Yv
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(Solitons)
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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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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11274255, 11305132 and 11475027, and the Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant No 20136203110001, and the Creation of Science and Technology of Northwest Normal University of China under Grant Nos NWNU-KJCXGC-03-48, NWNU-LKQN-12-12 and NWNU-LKQN-10-27. |
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