Universal single-frequency oscillations in a quantum impurity system after a local quench
Universal single-frequency oscillations in a quantum impurity system after a local quench
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DOI：
10.1103/physrevb.92.155141
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发表时间：
2015-10-26
影响因子：
3.7
通讯作者：
Sodano, Pasquale
中科院分区：
文献类型：
--
作者：
Bayat, Abolfazl;Bose, Sougato;Sodano, Pasquale
在量子多体系统的局域非平衡动力学中，普遍的单频振荡是一种特殊的现象。事实上，到目前为止，这从来没有被观察到或预测的物理相关的情况下，系统准备从一个量子相位到另一个量子相位猝灭。在这里，我们展示了如何淬火动力学的纠缠谱可能会揭示出现这样的振荡与近藤杂质的相关量子系统。我们发现的振荡的特点是由一个单一的频率。该频率与局部失超所释放的能量无关，并且与逆系统的大小成比例。重要的是，与猝灭无关的频率也表现在局部观测值中，例如杂质的自旋-自旋相关函数。
Universal single-frequency oscillations in the local nonequilibrium dynamics of a quantum many-body system are an exceptional phenomenon. In fact, till now, this has never been observed or predicted for the physically relevant case where a system is prepared to be quenched from one quantum phase to another. Here we show how the quench dynamics of the entanglement spectrum may reveal the emergence of such oscillations in a correlated quantum system with Kondo impurities. The oscillations we find are characterized by a single frequency. This frequency is independent of the amount of energy released by the local quench, and scales with the inverse system size. Importantly, the quench-independent frequency manifests itself also in local observables, such as the spin-spin correlation function of the impurities.