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Tunnelling Dynamics of Bose--Einstein Condensates in a Five-Well Trap |
| ZHANG Ai-Xia, TIAN Shi-Ling, TANG Rong-An, XUE Ju-Kui |
| Physics and Electronics Engineering College, Northwest Normal University, Lanzhou 730070 |
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| Cite this article: |
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ZHANG Ai-Xia, TIAN Shi-Ling, TANG Rong-An et al 2008 Chin. Phys. Lett. 25 3566-3569 |
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Abstract We develop a five-well model for describing the tunnelling dynamics of Bose--Einstein condensates (BECs) trapped in 2D optical lattices. The tunnelling dynamics of BECs in this five-well model are investigated both analytically and numerically. We focus on the self-trapped states and the difference of the tunnelling dynamics among two-well, three-well and five-well systems. The criterions for the self-trapped states and the phase diagrams of the five trapped BECs in zero-phase mode and π-phase mode are obtained. We find that the criterions and the phase diagrams are largely modified by the dimension of the system and the phase difference between wells. The five-well model is a good model and can give us an insight into the tunnelling dynamics of BECs trapped in 2D optical lattices.
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03.75.Kk
67.40.Db
03.65.Ge
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Received: 19 March 2008
Published: 26 September 2008
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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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67.40.Db
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03.65.Ge
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(Solutions of wave equations: bound states)
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