非极化预热离散时间晶体
Unpolarized prethermal discrete time crystal
AI总结：
提出无需极化的非极化预热离散时间晶体（UPDTCs），通过量子涨落实现稳健的周期加倍动力学，扩展了预热时间晶体机制。
摘要：
预热离散时间晶体（DTCs）是周期性驱动物质的一种新相，它表现出稳健的次谐波振荡而无需无序。然而，先前对预热DTCs的实现依赖于极化的存在，无论是自发的还是诱导的。在这里，我们引入了一类新的预热DTCs，称为“非极化预热离散时间晶体”（UPDTCs），它在没有任何均匀/交错极化的情况下出现，并提出了在当前 trapped-ion 量子模拟器中观察它们的实验。通过使用量子电路模拟器研究 trapped ions 模型，我们证明稳健的周期加倍动力学可以在交错磁化的自相关函数中持续存在，即使其期望值不表现出这种动力学。周期加倍动力学不能用翻转自旋的经典图像来解释，而是由量子涨落解释。我们确定UPDTCs在高频驱动区域具有指数长的寿命，这是预热化的一个标志。这些结果扩展了预热时间晶体已知的现象学和机制，并强调了量子效应在稳定新非平衡相中的作用。
英文摘要：
Prethermal discrete time crystals (DTCs) are a novel phase of periodically driven matter that exhibits robust subharmonic oscillations without requiring disorder. However, previous realizations of prethermal DTCs have relied on the presence of polarization, either spontaneous or induced. Here, we introduce a new class of prethermal DTCs termed ``unpolarized prethermal discrete time crystals'' (UPDTCs) that arise without any uniform/staggered polarization and propose an experiment to observe them in current trapped-ion quantum simulators. By studying a model of trapped ions using a quantum circuit simulator, we demonstrate that robust period-doubled dynamics can persist in the autocorrelation function of the staggered magnetization, even though its expectation value does not exhibit such dynamics. The period-doubled dynamics is not explained by the classical picture of flipping spins but by quantum fluctuations. We establish that UPDTCs are exponentially long-lived in the high-frequency driving regime, a hallmark of prethermalization. These results expand the known phenomenology and mechanism of prethermal time crystals and underscore the role of quantum effects in stabilizing novel nonequilibrium phases.
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