Gate-controlled superconductivity in diffusive multiwalled carbon nanotube

Abstract

We have investigated electrical transport in a diffusive multiwalled carbon nanotube contacted using superconducting leads made of Al/Ti sandwich structure. We find proximity-induced superconductivity with measured critical currents up to I_cm = 1.3 nA, tunable by gate voltage down to 10 pA. The supercurrent branch displays a finite zero bias resistance which varies as R_0 proportional to I_cm^-alpha with alpha=0.74. Using IV-characteristics of junctions with phase diffusion, a good agreement is obtained with Josephson coupling energy in the long, diffusive junction model of A.D Zaikin and G.F. Zharkov (Sov. J. Low Temp. Phys. 7, 184 (1981)).

5 pages, 4 figures

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Cited by in corpus (13)

• Superconductivity in one dimension
• Tuning the Josephson current in carbon nanotubes with the Kondo effect
• Superconductivity-enhanced bias spectroscopy in carbon nanotube quantum dots
• Phase diffusion in graphene-based Josephson junctions
• Proximity effect on spin-dependent conductance and thermopower of correlated quantum dots
• Carbon Nanotube Quantum Dots with Nb Contacts
• Gate-tuned high frequency response of carbon nanotube Josephson junctions
• Fine structure of the local pseudogap and Fano effect for superconducting electrons near a zigzag graphene edge
• Gate Tunable Dissipation and "Superconductor-Insulator" Transition in Carbon Nanotube Josephson Transistors
• Impact of electrostatic fields in layered crystalline BCS superconductors
• Current-Phase Relation and Josephson Inductance of Superconducting Cooper Pair Transistor
• Supergap anomalies in cotunneling between N-S and between S-S leads via a small quantum dot
• Wideband superconducting nanotube electrometer