Macroscopic self-trapping in Bose-Einstein condensates: Analysis of a dynamical quantum phase transition
Macroscopic self-trapping in Bose-Einstein condensates: Analysis of a dynamical quantum phase transition
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DOI：
10.1103/physreva.81.023615
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发表时间：
2009-12
影响因子：
2.9
通讯作者：
B. Juliá-Díaz;D. Dagnino;M. Lewenstein;J. Martorell;A. Polls
中科院分区：
文献类型：
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作者：
B. Juliá-Díaz;D. Dagnino;M. Lewenstein;J. Martorell;A. Polls
本文研究了双势阱中玻色-爱因斯坦凝聚体从约瑟夫森振荡态到自陷态的动力学转变。我们分析的统计特性的基态（或最高激发态）的哈密顿量在这两个制度的吸引（排斥）的相互作用。我们证明，这是不可能的平均场理论内描述的过渡。与此相反，过渡收益通过强相关的离域状态，大的量子涨落，和自发破缺的对称性。
We consider a Bose-Einstein condensate in a double-well potential undergoing a dynamical transition from the regime of Josephson oscillations to the regime of self-trapping. We analyze the statistical properties of the ground state (or the highest excited state) of the Hamiltonian in these two regimes for attractive (repulsive) interactions. We demonstrate that it is impossible to describe the transition within the mean-field theory. In contrast, the transition proceeds through a strongly correlated delocalized state, with large quantum fluctuations, and spontaneous breaking of the symmetry.