arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2010.02253cond-mat.str-elcond-mat.dis-nnquant-ph
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二维具有$U(1)$对称性的相互作用Floquet相的分类

Classification of interacting Floquet phases with $U(1)$ symmetry in two dimensions

Carolyn Zhang, Michael Levin

摘要:

本文导出了二维空间中具有$U(1)$对称性的相互作用玻色子和费米子的Floquet相的完整分类。根据我们的分类,这些Floquet相位和有理函数$π(z) = a(z)/b(z)$之间存在一一对应关系,其中$a(z)$和$b(z)$是服从某些条件的多项式,$z$是形式参数。$π(z)$的物理含义涉及相应Floquet系统的频闪边缘动力学:在玻色子系统的情况下,为$π(z) = \frac{p}{q} \cdot \tildeπ(z)$,其中$\frac{p}{q}$是一个有理数,表征每个驱动周期期间边缘处量子信息的流动,而$\tildeπ(z)$是一个有理数函数,表征边缘处$U(1)$电荷的流动。在费米子的情况下也存在类似的分解。我们还表明,$\tildeπ(z)$是直接相关的时间平均$U(1)$电流,在一个特定的几何形状流动。这个$U(1)$电流是在以前的非相互作用费米子Floquet相位的研究中发现的量子化电流和量子化磁化密度的概括。

英文摘要:

We derive a complete classification of Floquet phases of interacting bosons and fermions with $U(1)$ symmetry in two spatial dimensions. According to our classification, there is a one-to-one correspondence between these Floquet phases and rational functions $π(z) = a(z)/b(z)$ where $a(z)$ and $b(z)$ are polynomials obeying certain conditions and $z$ is a formal parameter. The physical meaning of $π(z)$ involves the stroboscopic edge dynamics of the corresponding Floquet system: in the case of bosonic systems, $π(z) = \frac{p}{q} \cdot \tildeπ(z)$ where $\frac{p}{q}$ is a rational number which characterizes the flow of quantum information at the edge during each driving period, and $\tildeπ(z)$ is a rational function which characterizes the flow of $U(1)$ charge at the edge. A similar decomposition exists in the fermionic case. We also show that $\tildeπ(z)$ is directly related to the time-averaged $U(1)$ current that flows in a particular geometry. This $U(1)$ current is a generalization of the quantized current and quantized magnetization density found in previous studies of non-interacting fermionic Floquet phases.

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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