Braiding of Majorana corner states in electric circuits and its non-Hermitian generalization

2019/02/28 by Motohiko Ezawa · 2 citations
Physics and Astronomy · #cond-mat.supr-con #cond-mat.mes-hall #physics.app-ph

paper · pdf · doi:10.1103/physrevb.100.045407

published as Phys. Rev. B 100, 045407 (2019) · 5 pages, 4 figures

arxiv created 2019/05/23 · arxiv updated 2019/07/17

Abstract

We propose to realize Majorana edge and corner states in electric circuits. First, we simulate the Kitaev model by an LC electric circuit and the p_x+ip_y model by an LC circuit together with operational amplifiers. Zero-energy edge states emerge in the topological phase, which are detectable by measuring impedance. Next, we simulate the Bernevig-Hughes-Zhang model by including an effective magnetic field without breaking the particle-hole symmetry, where zero-energy corner states emerge in the topological phase. It is demonstrated that they are Ising anyons subject to the braiding. Namely we derive σ²=-1 for them, where σ denotes the single-exchange operation. They may well be called Majorana states. We also study non-Hermitian generalizations of these models by requiring the particle-hole symmetry. It is shown that the braiding holds in certain reciprocal non-Hermitian generalizations.

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