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arXiv 2409.04892cond-mat.str-elcond-mat.quant-gasquant-ph
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有限频率下的Floquet动态手性自旋液体

Floquet dynamical chiral spin liquid at finite frequency

Laboratoire de Physique Théorique, C.N.R.S. and Université de Toulouse(图卢兹大学理论物理实验室);Laboratoire Kastler Brossel, Collège de France, CNRS, ENS-Université PSL, Sorbonne Université(巴黎高等师范学院-PSL大学索邦大学卡斯勒-布罗塞尔实验室);Center for Nonlinear Phenomena and Complex Systems, Université Libre de Bruxelles(布鲁塞尔自由大学非线性现象与复杂系统中心)

Didier Poilblanc, Matthieu Mambrini, Nathan Goldman

AI总结:

该研究通过有限频率下的Floquet调制,在正方形晶格上稳定了动态手性自旋液体,并揭示了其拓扑性质与张量规范对称性的关联。

摘要:

手性自旋液体(CSL)是量子自旋的电子分数陈数的类比。其在超冷原子或瑞利德原子平台上的实现仍然非常具有挑战性。最近,提出了一种在正方形晶格上初始真实自旋液体态上应用最近邻Heisenberg耦合的时序周期性调制的设置,以稳定一个(阿贝尔)Z₂ CSL相。在高频极限下,已显示时间演化可以描述为静态有效手性哈密顿量。这里我们重新审视这一提议,并考虑较低频率的驱动,在高频Magnus展开失效的范围内。我们显示,尽管如此,动态CSL(DCSL)仍能在有限的频率范围内被稳定。该动态相的拓扑性质,以及其在临界频率以下的不稳定性,与Floquet伪能谱的特定特征有关。我们还显示,DCSL可以由二维时间周期性张量网络忠实表示,并且如同静态情况一样,拓扑序与张量规范对称性(该情况下为Z₂)相关。

英文摘要:

Chiral Spin Liquids (CSL) are quantum spin analogs of electronic Fractional Chern Insulators. Their realizations on ultracold-atom or Rydberg-atom platforms remain very challenging. Recently, a setup of time-periodic modulations of nearest-neighbor Heisenberg couplings applied on an initial genuine spin liquid state on the square lattice has been proposed to stabilize a (Abelian) $\mathbb{Z}_2$ CSL phase. In the high-frequency limit, it was shown that time evolution can be described in terms of a static effective chiral Hamiltonian. Here we revisit this proposal and consider drives at lower frequency in a regime where the high-frequency Magnus expansion fails. We show that a Dynamical CSL (DCSL) is nevertheless stabilized in a finite range of frequency. The topological nature of this dynamical phase, as well as its instability below a critical frequency, is connected to specific features of the Floquet pseudo-energy spectrum. We also show that the DCSL can be represented faithfully by a two-dimensional time-periodic tensor network and, as in the static case, topological order is associated to a tensor gauge symmetry ($\mathbb{Z}_2$ in that case).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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