受驱动原子阱中动态吸引子间布居的自发对称性破缺：Ising类相变
Spontaneous Symmetry Breaking of Population between Two Dynamic Attractors in a Driven Atomic Trap: Ising-class Phase Transition
摘要：
在动态相空间双势系统中观察到了原子布居的自发对称性破缺，这种破缺是在参量驱动的原子磁光阱中产生的。我们发现该系统具有类似于Ising类相变的特征，并且可以计算出控制参数的临界值，即总原子序数。特别是当原子序数原子序数较大时，激光阴影的集体效应占主导地位，这是导致动态两态系统布居不对称的原因。这一研究对研究动态相变和临界现象的时间行为是有用的。
英文摘要：
We have observed spontaneous symmetry breaking of atomic populations in the dynamic phase-space double-potential system, which is produced in the parametrically driven magneto-optical trap of atoms. We find that the system exhibits similar characteristics of the Ising-class phase transition and the critical value of the control parameter, which is the total atomic number, can be calculated. In particular, the collective effect of the laser shadow becomes dominant at large atomic number, which is responsible for the population asymmetry of the dynamic two-state system. This study may be useful for investigation of dynamic phase transition and temporal behaviour of critical phenomena.
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