Semiclassical approach to survival probability at quantum phase transitions
Semiclassical approach to survival probability at quantum phase transitions
复制标题
量子相变生存概率的半经典方法
DOI：
10.1103/physreve.81.016214
复制
发表时间：
2010-01-01
影响因子：
2.4
通讯作者：
Wang, Ping
中科院分区：
文献类型：
--
作者：
Wang, Wen-ge;Qin, Pinquan;Wang, Ping
我们研究了在临界点具有无限简并地能级的量子相变中生存概率的衰减。在相当长的时间内，半经典理论预测了d=1的系统的生存概率的幂律衰减和d足够大的系统的指数衰减，其中d是系统的经典对应的自由度。这些预测在四个模型中进行了数值验证。
We study the decay of survival probability at quantum phase transitions with infinitely degenerate ground levels at critical points. For relatively long times, the semiclassical theory predicts power-law decay of the survival probability in systems with d=1 and exponential decay in systems with sufficiently large d, where d is the degrees of freedom of the classical counterpart of the system. The predictions are checked numerically in four models.