Conductance asymmetry in proximitized magnetic topological insulator junctions with Majorana modes

Abstract

We theoretically discuss electronic transport via Majorana states in magnetic topological insulator-superconductor junctions with an asymmetric split of the applied bias voltage. We study normal-superconductor-normal (NSN) junctions made of narrow (wire-like) or wide (film-like) magnetic topological insulator slabs with a central proximitized superconducting sector. The occurrence of charge non-conserving Andreev processes entails a nonzero conductance related to an electric current flowing to ground from the proximitized sector of the NSN junction. We show that topologically-protected Majorana modes require an antisymmetry of this conductance with respect to the point of equally split bias voltage across the junction.

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Cited by in corpus (2)

• Quantum-anomalous-Hall current patterns and interference in thin slabs of chiral topological superconductors
• Electrostatic gating and the interference of chiral Majoranas in thin slabs of magnetic topological insulators