在合参数振荡器中散射时间晶体的理论
1University of Maryland, College Park, Joint Quantum Institute, Condensed Matter Theory Center and , Department of Physics, Maryland 20742-4111, USA.
Physical review letters
|January 29, 2025
概括
使用参数驱动的合振荡器建模了离散时间晶体,即物质的新阶段. 这种古典系统表现出强大的离散时间晶体相,即使有对称性破坏.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子力学就是量子力学.
- 非线性动力学是一种非线性动力学.
背景情况:
- 离散时间晶体代表了一种新的物质阶段,在周期驱动系统中打破了离散时间转换对称性.
- 了解离散时间晶体对于推进量子技术和基本物理学至关重要.
- 之前的研究主要集中在量子系统上,使得古典类型的模拟物不那么被探索.
研究的目的:
- 提出和研究一个古典的弱非线性参数驱动合振荡器系统作为离散时间晶体的测试台.
- 为了证明这个经典系统中周期翻倍的不稳定性导致离散的时间晶体相.
- 为了在各种近似和条件下确定这些离散时间晶相的稳定性.
主要方法:
- 模拟一个弱非线性参数驱动合振荡器的经典系统.
- 分析系统的行为在一个极限接近Langevin动力学在一个对称性破坏的潜力.
- 使用Glauber动力学近似的数值模拟来研究Ising对称性破坏下的相位稳定性.
- 使用场理论论证来评估对近似的稳定性,例如散射量子系统的半经典极限.
主要成果:
- 提出的经典系统有效地模拟了与约瑟夫森连接阵列和半导体激光器相关的周期翻倍不稳定性.
- 数字模拟证实了古典系统中存在离散时间晶相的存在,即使有Ising对称性破坏.
- 场理论分析证明了这些发现对各种近似的稳定性,包括半古典极限.
结论:
- 参数驱动合振荡器的经典系统可以作为研究离散时间晶体的可行和有洞察力的测试台.
- 已识别的离散时间晶相表现出强度,表明广泛的适用性和实验实现的潜力.
- 这项工作弥合了时间晶体的经典和量子描述之间的差距,为研究提供了新的途径.
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