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Nonequilibrium Josephson effect through helical edge states.

Driss M Badiane¹, Manuel Houzet, Julia S Meyer

¹SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble, F-38054, France.

Physical Review Letters

|November 24, 2011

Summary

This summary is machine-generated.

We investigated Josephson junctions in topological insulators. The fractional Josephson effect was absent in average current but detected in current noise, revealing Majorana bound states.

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Area of Science:

Condensed Matter Physics
Topological Materials
Superconductivity

Background:

Josephson junctions are key to superconductivity.
Topological insulators host unique edge states.
Helical edge states in 2D topological insulators are of significant interest.

Purpose of the Study:

Investigate Josephson junctions formed via topological insulator edge states.
Explore the presence of fractional Josephson effect at finite bias.
Identify signatures of Majorana bound states.

Main Methods:

Utilized the scattering matrix formalism.
Analyzed equilibrium Andreev bound states.
Examined DC bias voltage effects on current and noise.

Main Results:

The fractional Josephson effect is absent in the average current.
Clear signatures of the fractional Josephson effect are observed in finite-frequency current noise.
Manifestations of Majorana bound states at superconductor edges are discussed.

Conclusions:

The study clarifies the behavior of Josephson junctions in topological insulators.
Finite-frequency current noise is a crucial indicator for fractional Josephson effects.
Further insights into Majorana bound states are provided.