UNSPECIFIED (2000) Kondo physics in carbon nanotubes. Nature, 408 (6810). pp. 342-346. ISSN 0028-0836

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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 nanotubes(1) are quantum wires that have been found to act as one-dimensional quantum dots(2,3), Luttinger liquids(4,5), proximity-induced superconductors(6,7) and ballistic(8) and diffusive(9) 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 explain(10) enhanced low-temperature scattering from magnetic impurities in metals, and also occurs in transport through semiconductor quantum dots(11-18). The far greater tunability of dots (in our case, nanotubes) compared with atomic impurities renders new classes of Kondo-like effects(19,20) 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.

Item Type:	Journal Article
Subjects:	Q Science
Journal or Publication Title:	Nature
Publisher:	MACMILLAN PUBLISHERS LTD
ISSN:	0028-0836
Date:	16 November 2000
Volume:	408
Number:	6810
Number of Pages:	6
Page Range:	pp. 342-346
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/12807

Data sourced from Thomson Reuters' Web of Knowledge

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