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arXiv 1507.01587cond-mat.str-el
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弱拓扑绝缘体对称能隙面上的反常准粒子对称性和非阿贝尔缺陷

Anomalous Quasiparticle Symmetries and Non-Abelian Defects on Symmetrically Gapped Surfaces of Weak Topological Insulators

David F. Mross, Andrew Essin, Jason Alicea, Ady Stern

摘要:

我们发现,三维弱拓扑绝缘体的边界可以成为间隙的强相互作用,同时保持所有的对称性,导致阿贝尔表面拓扑秩序。弱拓扑绝缘体的反常性质表现在准粒子上对称性的非平凡作用上;最引人注目的是,平移以一种在具有相同对称性的严格二维系统中不可能的方式改变了任意子的类型。作为进一步的结果,螺旋位错形成捕获$\mathbb{Z}_4$仲费米子零模的非阿贝尔缺陷。

英文摘要:

We show that boundaries of 3D weak topological insulators can become gapped by strong interactions while preserving all symmetries, leading to Abelian surface topological order. The anomalous nature of the weak topological insulators manifests itself in a non-trivial action of symmetries on the quasiparticles; most strikingly, translations change the anyon types in a manner impossible in strictly 2D systems with the same symmetry. As a further consequence, screw dislocations form non-Abelian defects that trap $\mathbb{Z}_4$ parafermion zero modes.

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