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Related Experiment Video

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Phase interference for probing topological fractional charge in a BiSbTeSe₂-based Josephson junction array.

J M Brevoord¹, D H Wielens¹, M Lankhorst¹

¹MESA+ Institute for Nanotechnology, University of Twente, The Netherlands.

|July 15, 2021

Summary

Researchers investigated fractional charges in topological insulator-superconductor interfaces. They observed phase interference in Josephson junction arrays but did not find clear evidence of axion charge effects.

Keywords:

Josephson junction arrays fractional charge phase interference topological insulator topological superconductivity

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Area of Science:

Condensed Matter Physics
Quantum Materials
Superconductivity

Background:

Fractional charges can arise at topological insulator (TI)-superconductor interfaces via axion electrodynamics.
Josephson junction arrays with holes exhibit unique magnetic flux-dependent phase interference.

Purpose of the Study:

To experimentally probe fractional charges induced by magnetic fluxes.
To investigate phase interference effects in superconducting arrays with holes.

Main Methods:

Fabrication and characterization of Josephson junction arrays using both gold and TI-based devices.
Numerical simulations using the resistive shunted capacitive junction model.
Application of magnetic fields to observe interference patterns.

Main Results:

Observed phase interference effects in both Au- and TI-based superconducting arrays with holes.
Experimental results showed good agreement with numerical simulations.
No definitive evidence for axion charge-related interference was detected.

Conclusions:

The study successfully demonstrated phase interference in superconducting arrays, validating the experimental setup.
Further investigations are needed to identify the elusive axion charge-related interference.
Future experiments will explore potential reasons for the lack of observed axion charge effects.