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Related Experiment Video

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Published on: August 2, 2019

Critical Current Scaling in Long Diffusive Graphene-Based Josephson Junctions.

Chung Ting Ke¹, Ivan V Borzenets², Anne W Draelos¹

¹Department of Physics, Duke University , Durham, North Carolina 27708, United States.

|July 9, 2016

Summary

We studied long, diffusive, graphene Josephson junctions. Critical current and Thouless energy varied widely, showing a linear relationship, but a key ratio was unexpectedly low.

Keywords:

Graphene Josephson junction Thouless energy diffusive SNS junction superconductivity

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Electronics

Background:

Graphene Josephson junctions are promising for quantum electronics.
Understanding transport properties in diffusive junctions is crucial for device applications.

Purpose of the Study:

To investigate the transport characteristics of long, diffusive graphene-based Josephson junctions.
To analyze the relationship between critical current, normal resistance, and Thouless energy.

Main Methods:

Fabrication of multiple graphene Josephson junctions with varying lengths (400-1000 nm) on CVD graphene.
Tuning carrier density via gate voltage to measure critical current and normal resistance.
Analysis of transport data in relation to Thouless energy.

Main Results:

Critical current ranged from nanoamperes to microamperes, and Thouless energy varied over two orders of magnitude.
The product of critical current and normal resistance (ICRN) scaled linearly with Thouless energy (ETh).
The ratio ICRN/ETh was found to be 0.1-0.2, significantly lower than theoretical predictions (~10).

Conclusions:

Graphene Josephson junctions exhibit tunable properties over a wide range.
Observed deviations from theory in the ICRN/ETh ratio suggest unique physics in these diffusive graphene systems.