Kondo physics in carbon nanotubes

ABSTRACT The connection of electrical leads to wire-like molecules is a logical step in the development of molecular electronics, but also allows studies of fundamental physics. For example,

metallic carbon nanotubes1 are quantum wires that have been found to act as one-dimensional quantum dots2,3, Luttinger liquids4,5, proximity-induced superconductors6,7 and ballistic8 and

diffusive9 one-dimensional metals. Here we report that electrically contacted single-walled carbon nanotubes can serve as powerful probes of Kondo physics, demonstrating the universality of

the Kondo effect. Arising in the prototypical case from the interaction between a localized impurity magnetic moment and delocalized electrons in a metallic host, the Kondo effect has been

used to explain10 enhanced low-temperature scattering from magnetic impurities in metals, and also occurs in transport through semiconductor quantum dots11,12,13,14,15,16,17,18. The far

greater tunability of dots (in our case, nanotubes) compared with atomic impurities renders new classes of Kondo-like effects19,20 accessible. Our nanotube devices differ from previous

systems in which Kondo effects have been observed, in that they are one-dimensional quantum dots with three-dimensional metal (gold) reservoirs. This allows us to observe Kondo resonances

for very large electron numbers (_N_) in the dot, and approaching the unitary limit (where the transmission reaches its maximum possible value). Moreover, we detect a previously unobserved

Kondo effect, occurring for even values of _N_ in a magnetic field. Access through your institution Buy or subscribe This is a preview of subscription content, access via your institution

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NETWORK OF CARBON NANOTUBES Article Open access 08 February 2022 NANO-ASSEMBLED OPEN QUANTUM DOT NANOTUBE DEVICES Article Open access 05 January 2024 A TWO-SITE KITAEV CHAIN IN A

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nanotubes, K. G. Rasmussen, M. M. Andreasen, A. E. Hansen and A. Kristensen for experimental assistance, and M. Pustilnik, N. Wingreen, L. P. Kouwenhoven, N. d'Ambrumenil, P. R. Poulsen

and P. L. McEuen for helpful discussions. AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Ørsted Laboratory, Niels Bohr Institute, Universitetsparken 5, Copenhagen, DK-2100 , Denmark Jesper

Nygård & Poul Erik Lindelof * Department of Physics, University of Warwick, Coventry, CV4 7AL, UK David Henry Cobden Authors * Jesper Nygård View author publications You can also search

for this author inPubMed Google Scholar * David Henry Cobden View author publications You can also search for this author inPubMed Google Scholar * Poul Erik Lindelof View author

publications You can also search for this author inPubMed Google Scholar CORRESPONDING AUTHOR Correspondence to David Henry Cobden. RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS

ARTICLE CITE THIS ARTICLE Nygård, J., Cobden, D. & Lindelof, P. Kondo physics in carbon nanotubes. _Nature_ 408, 342–346 (2000). https://doi.org/10.1038/35042545 Download citation *

Received: 30 May 2000 * Accepted: 03 October 2000 * Issue Date: 16 November 2000 * DOI: https://doi.org/10.1038/35042545 SHARE THIS ARTICLE Anyone you share the following link with will be

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