介子质量决定异常动力学量子相变的起始时间
Meson Mass Sets Onset Time of Anomalous Dynamical Quantum Phase Transitions
AI总结：
本文在两个典型模型中揭示异常动力学量子相变的起始时间通过幂律与禁闭相中的介子质量直接相关，并表明越接近平衡量子临界点该关系越显著，从而建立了介子与异常DQPTs的直接联系。
摘要：
动力学量子相变（DQPTs）已被确立为研究远离平衡的量子多体临界性的严格框架。尽管最初被认为与序参量翻转符号存在简单联系，但人们发现了一类“异常”DQPTs，它们与序参量没有直接联系，并且已被证明在禁闭存在时出现。在此，我们在两个典型模型中展示了异常DQPTs的起始时间如何通过幂律直接与全局对称破缺相禁闭区域中的介子质量相联系。当初态参数越接近平衡量子临界点时，这一关系越显著，而在该临界点处会涌现出相对论量子场论。我们的发现建立了介子与异常DQPTs之间的直接联系，凸显了后者在分类奇异远离平衡临界性方面的能力。
英文摘要：
Dynamical quantum phase transitions (DQPTs) have been established as a rigorous framework for investigating far-from-equilibrium quantum many-body criticality. Although initially thought to be trivially connected to an order parameter flipping sign, a certain kind of \textit{anomalous} DQPTs have been discovered that exhibit no direct connection to the order parameter and have been shown to arise in the presence of confinement. Here, we show in two paradigmatic models how the onset time of anomalous DQPTs is directly connected, through a power law, to the meson mass in the confined regime of a global symmetry-broken phase. This relation becomes more prominent the closer the initial parameters are to the equilibrium quantum critical point, where a relativistic quantum field theory emerges. Our findings draw a direct connection between mesons and anomalous DQPTs, highlighting the power of the latter to classify exotic far-from-equilibrium criticality.
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