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arXiv 1601.01094cond-mat.str-elcond-mat.mes-hall
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来自量子线或自旋链阵列的非阿贝尔拓扑自旋液体

Non-Abelian topological spin liquids from arrays of quantum wires or spin chains

Po-Hao Huang, Jyong-Hao Chen, Pedro R. S. Gomes, Titus Neupert, Claudio Chamon, Christopher Mudry

摘要:

我们利用一维量子线阵列通过相互作用强耦合,构造了二维非阿贝尔拓扑有序态。在我们的方案中,所有的电荷自由度都是有间隙的,所以这种结构可以使用量子线或量子自旋链作为构建块,最终结果是相同的。该结构在体中的自由度的间隙,而在边缘处的共形场论(CFT)所描述的$(1+1)$维空间和时间离开去耦状态。我们认为这两种情况下,时间反演对称性(TRS)存在或不存在。当TRS不存在时,边缘态是手性的和稳定的。我们规定,特别是,如何达到所有的边缘状态所描述的酉CFT极小模型与中心荷$c<1$。这些非阿贝尔自旋液体状态有消失的量子霍尔电导率,但非零的热。当TRS存在时,我们描述了体态可以是非阿贝尔、非手性和带隙的量子自旋液体或无隙的情况。在前一种情况下,我们发现边缘态也是带隙的。本文对非阿贝尔玻色化和仿射流代数作了简要的回顾,目的是使它们成为自包含的。为了说明在热身运动的方法,我们恢复的10倍的方式分类的二维非相互作用的拓扑绝缘体使用马约拉纳表示,自然产生的非阿贝尔玻色子。在该方案中,分类减少到计算质量矩阵的零奇异值的数量,当左和右零特征向量存在时,存在无间隙边缘模式。

英文摘要:

We construct two-dimensional non-Abelian topologically ordered states by strongly coupling arrays of one-dimensional quantum wires via interactions. In our scheme, all charge degrees of freedom are gapped, so the construction can use either quantum wires or quantum spin chains as building blocks, with the same end result. The construction gaps the degrees of freedom in the bulk, while leaving decoupled states at the edges that are described by conformal field theories (CFT) in $(1+1)$-dimensional space and time. We consider both the cases where time-reversal symmetry (TRS) is present or absent. When TRS is absent, the edge states are chiral and stable. We prescribe, in particular, how to arrive at all the edge states described by the unitary CFT minimal models with central charges $c<1$. These non-Abelian spin liquid states have vanishing quantum Hall conductivities, but non-zero thermal ones. When TRS is present, we describe scenarios where the bulk state can be a non-Abelian, non-chiral, and gapped quantum spin liquid, or a gapless one. In the former case, we find that the edge states are also gapped. The paper provides a brief review of non-Abelian bosonization and affine current algebras, with the purpose of being self-contained. To illustrate the methods in a warm-up exercise, we recover the ten-fold way classification of two-dimensional non-interacting topological insulators using the Majorana representation that naturally arises within non-Abelian bosonization. Within this scheme, the classification reduces to counting the number of null singular values of a mass matrix, with gapless edge modes present when left and right null eigenvectors exist.

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