Detecting the Exchange Phase of Majorana Bound States in a Corbino Geometry Topological Josephson Junction

TL;DR

This paper proposes an experimental setup using a Corbino-geometry Josephson junction on a topological insulator surface to detect the exchange phase of Majorana bound states through conductance peaks, providing a clear signature of their anyonic nature.

Contribution

It introduces a novel experimental configuration to observe the exchange phase of Majorana bound states via conductance measurements in a Corbino Josephson junction.

Findings

Peaks in differential conductance at specific voltages indicate Majorana exchange phase.

The exchange phase of π/2 leads to identifiable conductance signatures.

The setup enables experimental detection of Majorana fermion exchange in topological systems.

Abstract

A phase from an adiabatic exchange of Majorana bound states (MBS) reveals their exotic anyonic nature. For detecting this exchange phase, we propose an experimental setup consisting of a Corbino-geometry Josephson junction on the surface of a topological insulator, in which two MBS at zero energy can be created and rotated. We find that if a metallic tip is weakly coupled to a point on the junction, the time-averaged differential conductance of the tip-Majorana coupling shows peaks at the tip voltages $eV = \pm (\alpha - 2\pi l) \hbar/ T_J$, where $\alpha = \pi/2$ is the exchange phase of the two circulating MBS, $T_J$ is the half rotation time of MBS, and $l$ an integer. This result constitutes a clear experimental signature of Majorana fermion exchange.