arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2311.08899quant-phnlin.AOphysics.atom-ph
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驱动-耗散量子系统中的自组织时间晶体

Self-Organized Time Crystal in Driven-Dissipative Quantum System

Ya-Xin Xiang, Qun-Li Lei, Zhengyang Bai, Yu-Qiang Ma

AI总结:

本文提出在量子接触模型中通过自组织双稳态实现新型连续时间晶体,揭示集体耗散与缓慢驱动相互作用下的自保护时间晶体相,为强相互作用开放系统中的时间晶体研究提供了新路径。

摘要:

连续时间晶体(CTCs)的特征是持续振荡,打破时间平移对称性。自从无-go定理排除了平衡态连续时间晶体以来,这种动力学相的出现已在各种驱动-耗散量子平台上被观测到。目前对连续时间晶体的理解主要基于平均场(MF)理论,这些理论无法解决在没有全对全耦合保护的情况下,噪声、空间扩展系统中是否存在长程时间晶体序的问题。在此,我们提出一种在量子接触模型中通过自组织双稳态(SOB)实现的新型连续时间晶体。这种奇异的连续时间晶体源于一阶吸收相变(APTs)诱导的集体耗散与非相干泵浦提供的缓慢恒定驱动之间的相互作用。通过泛函重整化群方法和数值模拟,我们仔细考察了这种振荡相在有限维度中、在内禀量子涨落作用下的稳定性。该连续时间晶体相出现在量子同步的边缘,表现出固有的周期和振幅,其相干时间随系统尺寸发散,因此也构成一种边界时间晶体(BTC)。我们的结果为在强相互作用开放系统中实现自保护的连续时间晶体提供了一条可靠的路径。

英文摘要:

Continuous time crystals (CTCs) are characterized by sustained oscillations that break the time translation symmetry. Since the ruling out of equilibrium CTCs by no-go theorems, the emergence of such dynamical phases has been observed in various driven-dissipative quantum platforms. The current understanding of CTCs is mainly based on mean-field (MF) theories, which fail to address the problem of whether the long-range time crystalline order exists in noisy, spatially extended systems without the protection of all-to-all couplings. Here, we propose a new kind of CTC realized in a quantum contact model through self-organized bistability (SOB). The exotic CTCs stem from the interplay between collective dissipation induced by the first-order absorbing phase transitions (APTs) and slow constant driving provided by an incoherent pump. The stability of such oscillatory phases in finite dimensions under the action of intrinsic quantum fluctuations is scrutinized by the functional renormalization group method and numerical simulations. Occurring at the edge of quantum synchronization, the CTC phase exhibits an inherent period and amplitude with a coherence time diverging with system size, thus also constituting a boundary time crystal (BTC). Our results serve as a solid route towards self-protected CTCs in strongly interacting open systems.

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