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Tunneling dynamics of Bose–Einstein condensates with higher-order interactions in optical lattice |
| Tie Lu(铁璐) and Xue Ju-Kui(薛具奎)† |
| Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronics Engineering, Northwest Normal University, Lanzhou 730070, China |
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Abstract The nonlinear Landau-Zener tunneling and nonlinear Rabi oscillations of Bose-Einstein condensate (BEC) with higher-order atomic interaction between the Bloch bands in an accelerating optical lattice are discussed. Within the two-level model, the tunneling probability of BEC with higher-order atomic interaction between Bloch bands is obtained. We finds that the tunneling rate is closely related to the higher-order atomic interaction. Furthermore, the nonlinear Rabi oscillations of BEC with higher-order atomic interaction between the bands are discussed by imposing a periodic modulation on the level bias. Analytical expressions of the critical higher-order atomic interaction for suppressing/enhancing the Rabi oscillations are obtained. It is shown that the critical value strongly depends on the modulation parameters (i.e., the modulation amplitude and frequency) and the strength of periodic potential.
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Received: 13 June 2011
Revised: 25 July 2011
Accepted manuscript online:
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PACS:
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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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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.Ss
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(Degenerate Fermi gases)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10774120 and 10975114), the Natural Science Foundation of Gansu Province of China (Grant No. 1010RJZA012), and the Science Foundation for Creation of Science and Technology of Northwest Normal University of China (Grant Nos. NWNU-KJCXGC-03-17 and NWNU-KJCXGC-03-48). |
Cite this article:
Tie Lu(铁璐) and Xue Ju-Kui(薛具奎) Tunneling dynamics of Bose–Einstein condensates with higher-order interactions in optical lattice 2011 Chin. Phys. B 20 120311
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