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arXiv 1902.06756cond-mat.str-elhep-thmath-phmath.MP
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富电磁背景格点上的Abel拓扑序

Abelian Topological Order on Lattice Enriched with Electromagnetic Background

Jing-Yuan Chen

摘要:

在物质的拓扑相中,内在拓扑有序和整体对称性之间的相互作用是一个有趣的任务。在研究具有离散整体对称性的拓扑序时,一个重要的系统方法是构造精确可解格模型。然而,对于连续的全局对称性,特别是电磁$U(1)$,晶格方法已经不太系统地发展。本文介绍了电磁背景下三维时空格点上一大类阿贝尔拓扑序的有效理论的系统构造。我们讨论了相关的拓扑性质,包括霍尔电导率和自旋c性质的电磁背景。这些有效的时空晶格理论中的一些可以很容易地映射到空间晶格上的微观哈密顿;其他的也可能揭示他们可能的微观哈密顿实现。我们的方法是基于$1$形式的$\mathbb{Z}$对称性的测量.我们的建设是自然相关的连续路径积分(加倍)$U(1)$陈-西蒙斯理论,通过后者的正式描述的Deligne-Beilinson上同调,当全球对称性下降,我们的建设可以减少到相关的交换拓扑秩序的Dijkgraaf-Witten模型,如预期的。

英文摘要:

In topological phases of matter, the interplay between intrinsic topological order and global symmetry is an interesting task. In the study of topological orders with discrete global symmetry, an important systematic approach is the construction of exactly soluble lattice models. However, for continuous global symmetry, in particular the electromagnetic $U(1)$, the lattice approach has been less systematically developed. In this paper, we introduce a systematic construction of effective theories for a large class of abelian topological orders on three-dimensional spacetime lattice with electromagnetic background. We discuss the associated topological properties, including the Hall conductivity and the spin-c nature of the electromagnetic background. Some of these effective spacetime lattice theories can be readily mapped to microscopic Hamiltonians on spatial lattice; others may also shed light on their possible microscopic Hamiltonian realizations. Our approach is based on the gauging of $1$-form $\mathbb{Z}$ symmetries. Our construction is naturally related to the continuum path integral of (doubled) $U(1)$ Chern-Simons theory, through the latter's formal description in terms of Deligne-Beilinson cohomology; when the global symmetry is dropped, our construction can be reduced to the Dijkgraaf-Witten model of associated abelian topological orders, as expected.

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