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We report a new scheme for fabrication of clean, suspended superconducting weak links from pristine single-walled carbon nanotubes (SWCNT). The SWCNTs were grown using the floating-catalyst chemical vapour deposition (FC-CVD) and directly deposited on top of prefabricated superconducting molybdenum-rhenium (MoRe) electrodes by thermophoresis at nearly ambient conditions. Transparent contacts to SWCNTs were obtained by vacuum-annealing the devices at 900 °C, which enabled proximity-induced supercurrents up to 53 nA. SWCNT weak links fabricated on MoRe/palladium bilayer sustained supercurrents up to 0.4 nA after annealing at relatively low temperature of 220 °C. The fabrication process does neither expose SWCNTs to lithographic chemicals, nor the contact electrodes to the harsh conditions of in situ CVD growth. Our scheme facilitates new experimental possibilities for hybrid superconducting devices.

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Publication history

Received: 16 January 2020
Revised: 04 August 2020
Accepted: 04 August 2020
Published: 03 September 2020
Issue date: December 2020

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© The Author(s) 2020

Acknowledgements

The authors thank Unto Suominen from VTT Technical Research Centre of Finland for help with the MoRe sputtering and Pasi Häkkinen for assistance with the fabrication at the initial stage of this project. This work was supported by the Academy of Finland projects 314448 (BOLOSE) and 312295 (CoE, Quantum Technology Finland) as well as by ERC (grant no. 670743). The research also received partial funding from the European Union Seventh Framework Program FP7 Nanosciences, Nanotechnologies, Materials and new Production Technologies (FP7/2007-2013) under Grant Agreement No. 604472 (IRENA project) and the Aalto Energy Efficiency (AEF) Research Program through the MOPPI project. In addition, the research was partially supported by the Academy of Finland (Luonnontieteiden ja Tekniikan Tutkimuksen Toimikunta) via projects 286546 (DEMEC) and 292600 (SUPER), as well as by TEKES Finland via projects 3303/31/2015 (CNT-PV) and 1882/31/ 2016 (FEDOC). This research project utilized the Aalto University OtaNano/ NanoFab and Aalto-NMC facilities, and Low Temperature Laboratory infrastructure, which is part of European Microkelvin Platform. J.-P. K. is grateful for the financial support from Vilho, Yrjö and Kalle Väisälä Foundation of the Finnish Academy of Science and Letters.

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Email: nanores@tup.tsinghua.edu.cn

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