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Related Experiment Video

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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

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Gate-controlled superconductivity in a diffusive multiwalled carbon nanotube.

T Tsuneta¹, L Lechner, P J Hakonen

¹Low Temperature Laboratory, Helsinki University of Technology, Otakaari 3A, Espoo, 02015 Finland.

Physical Review Letters

|March 16, 2007

Summary

We observed proximity-induced superconductivity in carbon nanotubes, with critical currents tunable via gate voltage. The supercurrent behavior aligns with the long, diffusive Josephson junction model.

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Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Superconductivity in low-dimensional materials is crucial for quantum technologies.
Carbon nanotubes offer unique electronic properties for exploring quantum phenomena.

Purpose of the Study:

Investigate electrical transport in diffusive multiwalled carbon nanotubes.
Characterize proximity-induced superconductivity and its gate voltage dependence.

Main Methods:

Fabrication of carbon nanotube junctions with superconducting aluminum/titanium leads.
Measurement of critical currents and current-voltage (IV) characteristics.
Analysis using the long, diffusive Josephson junction model.

Main Results:

Observed proximity-induced superconductivity with critical currents up to 1.3 nA.
Demonstrated gate voltage tunability of critical currents from 1.3 nA down to 10 pA.
Measured a finite zero-bias resistance proportional to critical current with an exponent of 0.74.

Conclusions:

The experimental results agree well with theoretical predictions for long, diffusive Josephson junctions.
Gate-tunable superconductivity in carbon nanotubes is feasible, opening avenues for electronic devices.