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arXiv 2002.10472hep-thcond-mat.str-elgr-qchep-lat
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含熔合荷的张量网络重整化:在三维格点规范理论中的应用

Tensor network renormalization with fusion charges: applications to 3d lattice gauge theory

William J. Cunningham, Bianca Dittrich, Sebastian Steinhaus

摘要:

张量网络方法是研究统计和量子系统,特别是一维和二维系统的性质和动力学的强大而有效的工具。近年来,这些方法被应用于格点规范理论,但这些理论仍然是一个挑战,在$(2+1)$维。在这篇文章中,我们提出了一种新的(装饰)张量网络算法,其中张量编码的格点规范振幅表示在融合基。这有几个优点:首先,融合基础对角化算子测量与分层区域集相关联的磁通量和电荷。因此,该算法允许直接访问这些可观测值。其次,融合的基础,而不是以前采用的自旋网络的基础上,稳定的粗粒化。第三,由于融合基的层次结构,该算法实现了预定义的解纠缠,消除了短尺度纠缠。我们应用这种新的算法定义的量子群$\text{SU}(2)_{\rm k}$的格点规范理论,并确定一个弱和强耦合阶段的各种水平$\rm k$。当我们增加$\rm k$水平时,临界耦合$g_c$线性降低,表明连续基团$\text{SU}(2)$不存在去澄清相。此外,我们说明了在这两个阶段的威尔逊环的标度行为。

英文摘要:

Tensor network methods are powerful and efficient tools to study the properties and dynamics of statistical and quantum systems, in particular in one and two dimensions. In recent years, these methods were applied to lattice gauge theories, yet these theories remain a challenge in $(2+1)$ dimensions. In this article, we present a new (decorated) tensor network algorithm, in which the tensors encode the lattice gauge amplitude expressed in the fusion basis. This has several advantages: Firstly, the fusion basis does diagonalize operators measuring the magnetic fluxes and electric charges associated to a hierarchical set of regions. The algorithm allows therefore a direct access to these observables. Secondly the fusion basis is, as opposed to the previously employed spin network basis, stable under coarse graining. Thirdly, due to the hierarchical structure of the fusion basis, the algorithm does implement predefined disentangles, that remove short-scale entanglement. We apply this new algorithm to lattice gauge theories defined for the quantum group $\text{SU}(2)_{\rm k}$ and identify a weak and a strong coupling phase for various levels $\rm k$. As we increase the level $\rm k$, the critical coupling $g_c$ decreases linearly, suggesting the absence of a deconfining phase for the continuous group $\text{SU}(2)$. Moreover, we illustrate the scaling behaviour of the Wilson loops in the two phases.

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