Superconductivity in carbon nanotubes

• Forschungsstelle: COST
• Projektnummer: C00.0020
• Projekttitel Englisch: Superconductivity in carbon nanotubes

Schlüsselwörter (Englisch)

Nanoelectronics; Carbon Nanotubes; Superconductivity; Proximity effect; CVD growth; FET

Forschungsprogramme (Englisch)

COST-Action P5 - Mesoscopic electronics

Kurzbeschreibung (Englisch)

See abstract

Partner und Internationale Organisationen (Englisch)

A, B, CZ, DK, FIN, F, D, H, I, NL, PL, SK, E, S, CH, GB

Abstract (Englisch)

We have studied electronic transport of individual multi-wall (MWNTs) and single-wall carbon nanotubes (SWNTs). Both systems behave as a quantum dots (QD) at low temperatures. Coulomb blockade, Kondo effect and level statistics have been explored. If instead of normal electrodes superconducting ones are used to contact MWNTs we found evidence of resonant multiple Andreev reflection (MAR) at bias voltages smaller than the superconducting gap of the electrodes. Strong dependence of the MAR structure on the level position of the single-electron states in the QD has been observed, which is explained by a theoretical model. Moreover, an intriguing interplay between superconductivity and Kondo effect, both many-electron phenomena, were studied. We have demonstrated that the Kondo effect can co-exist with superconductivity when the Kondo temperature exceeds the superconducting gap energy.

Datenbankreferenzen (Englisch)

Swiss Database: COST-DB of the State Secretariat for Education and Research Hallwylstrasse 4 CH-3003 Berne, Switzerland Tel. [phone] Swiss Project-Number: C00.0020