Suspended superconducting weak links from aerosol-synthesized single-walled carbon nanotubes

Jukka Pekka Kaikkonen, Abhilash Thanniyil Sebastian, Patrik Laiho, Nan Wei, Marco Will, Yongping Liao, Esko I. Kauppinen, Pertti J. Hakonen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

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. [Figure not available: see fulltext.]

Original languageEnglish
JournalNano Research
DOIs
Publication statusAccepted/In press - 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • carbon nanotube
  • electrical transport
  • floating catalyst chemical vapour deposition
  • Josephson junction
  • thermophoresis

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    Kaikkonen, J. P., Sebastian, A. T., Laiho, P., Wei, N., Will, M., Liao, Y., Kauppinen, E. I., & Hakonen, P. J. (Accepted/In press). Suspended superconducting weak links from aerosol-synthesized single-walled carbon nanotubes. Nano Research. https://doi.org/10.1007/s12274-020-3032-1