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arXiv 1403.0953cond-mat.str-el
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二维拓扑相的线解构

Wire deconstructionism of two-dimensional topological phases

Titus Neupert, Claudio Chamon, Christopher Mudry, Ronny Thomale

摘要:

提出了一种在二维空间中构造费米子的整数和分数拓扑量子态的方案。我们设计这种状态的模型,通过耦合线的非手性Luttinger液体的电子,这是安排在一个周期性的阵列。允许哪种线间耦合由对称性和兼容性标准决定,即它们可以同时获得有限的期望值,从而在基态和体中的所有激发态之间打开光谱间隙。首先,有了这些标准,我们再现了整数拓扑绝缘体的十重分类表,在Luttinger液体描述中,它们对相互作用的稳定性立即变得透明。其次,我们构建了一个例子,一个强相互作用的费米拓扑相的物质与短程纠缠,位于十倍分类之外。第三,我们将该表扩展到具有内禀拓扑序和分数激发的长程纠缠拓扑相。

英文摘要:

A scheme is proposed to construct integer and fractional topological quantum states of fermions in two spatial dimensions. We devise models for such states by coupling wires of non-chiral Luttinger liquids of electrons, that are arranged in a periodic array. Which inter-wire couplings are allowed is dictated by symmetry and the compatibility criterion that they can simultaneously acquire a finite expectation value, opening a spectral gap between the ground state(s) and all excited states in the bulk. First, with these criteria at hand, we reproduce the tenfold classification table of integer topological insulators, where their stability against interactions becomes immediately transparent in the Luttinger liquid description. Second, we construct an example of a strongly interacting fermionic topological phase of matter with short-range entanglement that lies outside of the tenfold classification. Third, we expand the table to long-range entangled topological phases with intrinsic topological order and fractional excitations.

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