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arXiv 1302.4560cond-mat.str-elcond-mat.mes-hall
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二维准费米零模阵列的拓扑相位

Topological phases in two-dimensional arrays of parafermionic zero modes

Michele Burrello, Bernard van Heck, Emilio Cobanera

摘要:

最近人们认识到,在分数拓扑绝缘体(FTI)边缘的超导体和铁磁体之间的界面上,可能存在具有投影非阿贝尔统计的零模,推广了Majorana束缚态的概念.在这里,我们研究这些非阿贝尔零模式,其相互作用所产生的充电和约瑟夫森能量的超导体的二维架构。我们推导出两个不同的阵列的平面上的FTI的低能量哈密顿,揭示了一个有趣的相互作用的系统的实空间几何形状和它的拓扑性质。一方面,在FTI边的长度与系统大小无关的几何结构中,阵列具有拓扑有序的相位,从而在微扰理论中产生量子复曲面码哈密顿量。另一方面,在边的长度与系统大小成比例的几何中,我们发现一个精确的对偶阿贝尔格点规范理论和没有拓扑秩序。

英文摘要:

It has recently been realized that zero modes with projective non-Abelian statistics, generalizing the notion of Majorana bound states, may exist at the interface between a superconductor and a ferromagnet along the edge of a fractional topological insulator (FTI). Here we study two-dimensional architectures of these non-Abelian zero modes, whose interactions are generated by the charging and Josephson energies of the superconductors. We derive low-energy Hamiltonians for two different arrays of FTIs on the plane, revealing an interesting interplay between the real-space geometry of the system and its topological properties. On the one hand, in a geometry where the length of the FTI edges is independent on the system size, the array has a topologically ordered phase, giving rise to a qudit toric code Hamiltonian in perturbation theory. On the other hand, in a geometry where the length of the edges scales with system size, we find an exact duality to an Abelian lattice gauge theory and no topological order.

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