Quantum backreaction of quantum fluid in Bose--Einstein condensates
Xu Yan(徐岩)a), Xiong Zu-Zhou(熊祖周)b)†, Chen Bing(陈兵)a), Li Zhao-Xin(李照鑫)a), and Tan Lei(谭磊)b)
a College of Science, Shandong University of Science & Technology, Qingdao 266000, China; b Institute of Theoretical Physics, Lanzhou University, Lanzhou 730000, China
Abstract In this paper, with the full field operator $\hat{\psi}$ expressed in terms of a particle-number-conserving mean-field ansatz, we investigate the dynamical behaviour of Bose--Einstein condensates from microscopic physics. Including the first-order term correction from single-particle excitation and the remaining higher-order term correction from collective excitations simultaneously, we obtain the formulation for a closed local expression of quantum backreaction Q, and discuss the influence on static Bose--Einstein condensates. Even though the quantum backreaction is small, it still has some influence on its dynamics.
Received: 12 March 2009
Revised: 10 May 2009
Accepted manuscript online:
(Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow)
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 10704031 and
1087150), the Scientific Research Foundation for Returned Scholars,
Ministry of Education of China, the Foundation of Shandong
Educational Committee, China (Grant No J08LI60), and the Research
Project of `SUST Spring Bud', China (Grant No 2008AZZ093).
Cite this article:
Xu Yan(徐岩), Xiong Zu-Zhou(熊祖周), Chen Bing(陈兵), Li Zhao-Xin(李照鑫), and Tan Lei(谭磊) Quantum backreaction of quantum fluid in Bose--Einstein condensates 2009 Chin. Phys. B 18 4734
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