| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Stability Diagrams of a Bose-Einstein Condensate in Excited Bloch Bands |
| LIANG Zhao-Xin1, HU Ban-Bi 1,2 |
| 1Department of Physics, Centre for Nonlinear Studies, and The Beijing-Hong Kong-Singapore Joint Centre for Nonlinear and Complex (Hong Kong), Hong Kong Baptist University, Kowloon Tong, Hong Kong2Department of Physics, University of Houston, Houston, Texas 77204-5005, USA |
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| Cite this article: |
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LIANG Zhao-Xin, HU Ban-Bi 2009 Chin. Phys. Lett. 26 016701 |
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Abstract Landau and dynamical instabilities of a Bose-Einstein condensate (BEC) in the excited bands of a one-dimensional optical lattice are investigated by the Gross-Pitaevskii theory. Our results show that there always exists Landau instability for a BEC in the whole region of excited bands.We also map out the dangerous zones of the dynamical instability. The experimental implications of the stability diagram are discussed.
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| Keywords:
67.80.-s
67.40.-w
03.75.Lm
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Received: 23 June 2008
Published: 24 December 2008
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| PACS: |
67.80.-s
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(Quantum solids)
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67.40.-w
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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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