Controllable Persistent Atom Current of Bose-Einstein Condensates in an Optical Lattice Ring |
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Authors: | ZHENG Gong-Ping and LIANG Jiu-Qing |
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Institution: | Institute of Theoretical Physics and Department of Physics, Shanxi
University, Taiyuan 030006, China |
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Abstract: | In this paper the macroscopic quantum state of
Bose-Einstein condensates in optical lattices is studied by solving the
periodic Gross-Pitaevskii equation in one-dimensional geometry. It is shown
that an exact solution seen to be a travelling wave of excited macroscopic
quantum states resultes in a persistent atom current, which can be controlled
by adjusting of the barrier height of the optical periodic potential. A
critical condition to generate the travelling wave is demonstrated and we
moreover propose a practical experiment to realize the persistent atom
current in a toroidal atom waveguide. |
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Keywords: | Bose-Einstein condensate persistent atom current |
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