无限温度下的量子关联：动力学长冈效应
Quantum correlations at infinite temperature: the dynamical Nagaoka effect
摘要：
量子关联在多体系统的高温动力学中起作用吗？一个共同的期望是，热涨落导致快速退相干，使动力学经典。在本文中，我们提供了一个引人注目的例子，一个单一的粒子创建在一个无特征的，无限的温度自旋浴，不仅表现出非经典动力学，但也诱导周围的自旋之间的强长寿的相关性。研究了原子极限下费米子或玻色子莫特绝缘体中产生的空穴的非平衡动力学，它对应于一个简并自旋系统。在没有相互作用的情况下，自旋关联纯粹来自量子干涉，并且这种关联既有反铁磁的，也有铁磁的，这与平衡的长冈效应形成了鲜明的对比。这些结果是相关的几个凝聚态自旋系统，并应使用最先进的玻色子或费米子量子气体显微镜观察。
英文摘要：
Do quantum correlations play a role in high temperature dynamics of many-body systems? A common expectation is that thermal fluctuations lead to fast decoherence and make dynamics classical. In this paper, we provide a striking example of a single particle created in a featureless, infinite temperature spin bath which not only exhibits non-classical dynamics but also induces strong long-lived correlations between the surrounding spins. We study the non-equilibrium dynamics of a hole created in a fermionic or bosonic Mott insulator in the atomic limit, which corresponds to a degenerate spin system. In the absence of interactions, the spin correlations arise purely from quantum interference, and the correlations are both antiferromagnetic and ferromagnetic, in striking contrast to the equilibrium Nagaoka effect. These results are relevant for several condensed matter spin systems, and should be observable using state of the art bosonic or fermionic quantum gas microscopes.
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