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Multiple Chiral Majorana Fermion Modes and Quantized Transport

Research paper by Jing Wang, Biao Lian

Indexed on: 28 May '18Published on: 28 May '18Published in: arXiv - Physics - Mesoscopic Systems and Quantum Hall Effect



Abstract

We propose a general recipe for chiral topological superconductor (TSC) in two dimensions with multiple $N$ chiral Majorana fermion modes from a quantied anomalous Hall insulator in proximity to an $s$-wave superconductor with nontrivial band topology. A concrete example is that a $N=3$ chiral TSC may be realized by coupling a magnetic topological insulator and the ion-based superconductor such as FeTe$_{1-x}$Se$_{x}$ ($x=0.45$). We further propose the electrical and thermal transport experiments to detect the Majorana nature of three chiral edge fermions. A unique signature is that the electrical conductance will be quantized into $(2/3)e^2/h$ in a quantized anomalous Hall-TSC junction, which is due to the fully random edge mode mixing of chiral Majorana fermions and is distinguished from possible trivial explanations.