A tunable two-impurity Kondo system in an atomic point contact

Jakob Bork, Yong Hui Zhang, Lars Diekhöner, L. Borda, Pascal Simon, Johann Kroha, Peter Wahl, Klaus Kern

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

Two magnetic atoms, one attached to the tip of a scanning tunnelling microscope and one adsorbed on a metal surface, each constituting a Kondo system, have been proposed as one of the simplest conceivable systems potentially exhibiting quantum critical behaviour. We have succeeded in implementing this concept experimentally for cobalt dimers clamped between a scanning tunnelling microscope tip and a gold surface. Control of the tip-sample distance with subpicometre resolution enables us to tune the interaction between the two cobalt atoms with unprecedented precision. Electronic transport measurements on this two-impurity Kondo system reveal a rich physical scenario, which is governed by a crossover from local Kondo screening to non-local singlet formation due to antiferromagnetic coupling as a function of separation of the cobalt atoms.

Original languageEnglish
Pages (from-to)901-906
Number of pages6
JournalNature Physics
Volume7
Issue number11
DOIs
Publication statusPublished - Nov 2011

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cobalt
impurities
microscopes
atoms
scanning
metal surfaces
crossovers
screening
dimers
gold
electronics
interactions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Bork, J., Zhang, Y. H., Diekhöner, L., Borda, L., Simon, P., Kroha, J., ... Kern, K. (2011). A tunable two-impurity Kondo system in an atomic point contact. Nature Physics, 7(11), 901-906. https://doi.org/10.1038/nphys2076

A tunable two-impurity Kondo system in an atomic point contact. / Bork, Jakob; Zhang, Yong Hui; Diekhöner, Lars; Borda, L.; Simon, Pascal; Kroha, Johann; Wahl, Peter; Kern, Klaus.

In: Nature Physics, Vol. 7, No. 11, 11.2011, p. 901-906.

Research output: Contribution to journalArticle

Bork, J, Zhang, YH, Diekhöner, L, Borda, L, Simon, P, Kroha, J, Wahl, P & Kern, K 2011, 'A tunable two-impurity Kondo system in an atomic point contact', Nature Physics, vol. 7, no. 11, pp. 901-906. https://doi.org/10.1038/nphys2076
Bork J, Zhang YH, Diekhöner L, Borda L, Simon P, Kroha J et al. A tunable two-impurity Kondo system in an atomic point contact. Nature Physics. 2011 Nov;7(11):901-906. https://doi.org/10.1038/nphys2076
Bork, Jakob ; Zhang, Yong Hui ; Diekhöner, Lars ; Borda, L. ; Simon, Pascal ; Kroha, Johann ; Wahl, Peter ; Kern, Klaus. / A tunable two-impurity Kondo system in an atomic point contact. In: Nature Physics. 2011 ; Vol. 7, No. 11. pp. 901-906.
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