来自单分子磁体阵列的时间晶体

Subhajit Sarkar, Yonatan Dubi
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引用次数: 0

摘要

时间晶体是一种独特的非平衡量子现象,在当前的量子技术中具有广阔的应用前景,标志着量子力学的重大进步。虽然传统上是在原子腔和光晶格系统中研究时间晶体,但寻求时间晶体的替代纳米级平台至关重要。在这里,我们从理论上预测了周期性驱动分子磁体阵列中的离散时间晶体,该磁体阵列以具有显著二次各向异性的自旋-S 海森堡哈密顿为模型,并采用了现实和实验相关的物理参数。令人惊讶的是,我们发现时间晶体响应频率与单个磁体的能级相关,并且基本上与交换耦合无关。后者出乎意料地通过磁化包络中的脉冲式振荡表现出来,预示着一种多体响应。这些结果表明,分子磁体可以成为研究时晶行为和其他可能的失衡量子多体动力学的丰富平台。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Time Crystals from single-molecule magnet arrays
Time crystals, a unique non-equilibrium quantum phenomenon with promising applications in current quantum technologies, mark a significant advance in quantum mechanics. Although traditionally studied in atom-cavity and optical lattice systems, pursuing alternative nanoscale platforms for time crystals is crucial. Here we theoretically predict discrete time-crystals in a periodically driven molecular magnet array, modeled by a spin-S Heisenberg Hamiltonian with significant quadratic anisotropy, taken with realistic and experimentally relevant physical parameters. Surprisingly, we find that the time-crystal response frequency correlates with the energy levels of the individual magnets and is essentially independent of the exchange coupling. The latter is unexpectedly manifested through a pulse-like oscillation in the magnetization envelope, signaling a many-body response. These results show that molecular magnets can be a rich platform for studying time-crystalline behavior and possibly other out-of-equilibrium quantum many-body dynamics.
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