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Vortical Solitons of Three-Dimensional Bose–Einstein Condensates under Both a Bichromatic Optical Lattice and Anharmonic Potentials |
| LI Feng-Bo, ZONG Feng-De**, WANG Ying |
Institute of Nonlinear Physics, Zhejiang Normal University, Jinhua 321004
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| Cite this article: |
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LI Feng-Bo, ZONG Feng-De, WANG Ying 2013 Chin. Phys. Lett. 30 060306 |
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Abstract We study Bose–Einstein condensate vortical solitons under both a bichromatic optical lattice and anharmonic potential. The vortical solitons are built in the form of a layer-chain structure made up of two fundamental vortices along the bichromatic optical lattice direction, which have not been reported before in the three-dimensional Bose–Einstein condensate. A variation approach is applied to find the optimum initial solutions of vortical solitons. The stabilities of the vortical solitons are confirmed by the numerical simulation of the time-dependent Gross–Pitaevskii equation. In particular, stable Bose–Einstein condensate vortical solitons with fundamental vortices of different atomic numbers in the external potential within a range of experimentally achievable timescales are found. We further manipulate the vortical solitons to an arbitrary position by steadily moving the bichromatic optical lattice, and find a stable region for the successful manipulation of vortical solitons without collapse. These results provide insight into controlling and manipulating the Bose–Einstein condensate vortical solitons for macroscopic quantum applications.
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Received: 06 February 2013
Published: 31 May 2013
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| PACS: |
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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03.75.Kk
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(Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow)
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05.45.Yv
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(Solitons)
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