星形星系团中周期驱动自旋的时间序
Temporal order in periodically driven spins in star-shaped clusters
摘要：
我们实验研究了初始未纠缠的$N=4$，10和37核自旋$\frac{1}{2}$时刻的星形集群的响应不精确的$π$脉冲序列，并表明，中心和卫星自旋之间的伊辛耦合的结果在强大的周期2磁化振荡。周期是稳定的浴效果，但幅度衰减的时间尺度取决于脉冲的不精确性。模拟揭示了一个半经典的图片，刚性的周期是由于随机效应的拉莫尔进动下的磁化周围的自旋。具有稳定周期性的时间尺度随着净初始磁化强度的增加而增加，即使在存在扰动的情况下，也表明对于每个自旋具有有限磁化强度的大型系统，具有鲁棒的时间有序相。
英文摘要：
We experimentally study the response of star-shaped clusters of initially unentangled $N=4$, 10 and 37 nuclear spin-$\frac{1}{2}$ moments to an inexact $π$-pulse sequence, and show that an Ising coupling between the centre and the satellite spins results in robust period-two magnetization oscillations. The period is stable against bath-effects but the amplitude decays with a time scale that depends on the inexactness of the pulse. Simulations reveal a semiclassical picture where the rigidity of the period is due to a randomizing effect of the Larmor precession under the magnetization of surrounding spins. The time scales with stable periodicity increase with net initial magnetization even in the presence of perturbations, indicating a robust temporal ordered phase for large systems with finite magnetization per spin.
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