Conductance oscillations and speed of chiral Majorana mode in a quantum-anomalous-Hall 2d strip

Abstract

We predict conductance oscillations in a quantum-anomalous Hall 2d strip having a superconducting region of length $L_x$ with a chiral Majorana mode. These oscillations require a finite transverse extension of the strip $L_y$ of a few microns or less. Measuring the conductance periodicity with $L_x$ and a fixed bias, or with bias and a fixed $L_x$, yields the speed of the chiral Majorana mode. The physical mechanism behind the oscillations is the interference between backscattered chiral modes from second to first interface of the NSN double junction. The interferometer effect is enhanced by the presence of side barriers.

arXiv comment9 pages, 9 figures. Added references. Added Supplemental Material results. Published version

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Cited by in corpus (6)

• Fabry-Pérot interferometry with gate-tunable 3D topological insulator nanowires
• Transport signatures of a quantum spin Hall - chiral topological superconductor junction
• Conductance asymmetry in proximitized magnetic topological insulator junctions with Majorana modes
• 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
• Magnetic orbital motion and 0.5$e^2/h$ conductance of quantum-anomalous-Hall hybrid strips