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Stability Diagrams of a Bose-Einstein Condensate in a Periodic Array of Quantum Wells |
| XUE Rui1, LIANG Zhao-Xin2, LI Wei-Dong1 |
| 1Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 0300062Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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| Cite this article: |
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XUE Rui, LIANG Zhao-Xin, LI Wei-Dong 2009 Chin. Phys. Lett. 26 070303 |
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Abstract With the help of a set of exact closed-form solutions to the stationary Gross-Pitaevskii equation, we comprehensively investigate Landau and dynamical instabilities of a Bose-Einstein condensate in a periodic array of quantum wells. In the tight-binding limit, the analytical expressions for both Landau and dynamical instabilities are obtained in terms of the compressibility and effective mass of the BEC system. Then the stability phase diagrams are shown to be similar to the one in the case of the sinusoidal optical lattice.
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03.75.Kk
67.10.-j
03.75.Lm
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Received: 27 March 2009
Published: 02 July 2009
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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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67.10.-j
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(Quantum fluids: general properties)
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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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