作者机构:[1]State Key Laboratory of Magnetic Resonance and Atornic and Molecular Physics, Wuhan lnstitute of Physics and Mathematics (WIPM), Chinese Academy of Sciences (CAS), Wuhan 430071, China, [2]Centers for Cold Atom Physics, CAS, Wuhan 430071, China, [3]Graduate School of the Chinese Academy of Sciences, Beijing 100049, China, [4]Department of Physics, Science College, National University of Defense Technology, Changsha 410073, China
相关基金:Acknowledgements We thank Prof. Yi-fu Zhu for useful discus- sion. This work was supported by the National Basic Research Pro- gram of China (Grant No. 2005CB724502), the National Natural Science Foundation of China (Grant Nos. 10874205 and 10774161) and the Chinese Academy of Sciences.