Erratum: Relaxation and Persistent Oscillations of the Order Parameter in Fermionic Condensates [Phys. Rev. Lett.96, 097005 (2006)]
Erratum: Relaxation and Persistent Oscillations of the Order Parameter in Fermionic Condensates [Phys. Rev. Lett.96, 097005 (2006)]
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勘误表：费米子凝聚体中有序参数的弛豫和持续振荡[Phys。
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
B. Altshuler
中科院分区：
文献类型：
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作者：
E. Yuzbashyan;O. Tsyplyatyev;B. Altshuler
在各种初始条件下，我们确定了突然微扰后费米子凝聚体的极限动力学。我们证明了凝聚态可能的初始态分为两类。在第一种情况下，序参数渐近于一个常数值。对常数的逼近是以反平方根衰减的方式振荡的。例如，当系统处于配对基态并且更一般地对于与基态处于同一类的任何非平衡态时，配对的强度突然改变时，就会发生这种情况。在第二种情况下，序参数表现出几个频率的持续振荡。对于与激发态属于同一类的非平衡态，这是可以实现的。我们对初始态的分类将激发谱的概念扩展到非平衡区，并允许人们在不求解运动方程的情况下预测演化。
We determine the limiting dynamics of a fermionic condensate following a sudden perturbation for various initial conditions. We demonstrate that possible initial states of the condensate fall into two classes. In the first case, the order parameter asymptotes to a constant value. The approach to a constant is oscillatory with an inverse square root decay. This happens, e.g., when the strength of pairing is abruptly changed while the system is in the paired ground state and more generally for any nonequilibrium state that is in the same class as the ground state. In the second case, the order parameter exhibits persistent oscillations with several frequencies. This is realized for nonequilibrium states that belong to the same class as excited stationary states. Our classification of initial states extends the concept of excitation spectrum to nonequilibrium regime and allows one to predict the evolution without solving equations of motion.