Noisy Kondo impurities

T. Delattre, C. Feuillet-Palma, L. G. Herrmann, P. Morfin, J. M. Berroir, G. Fève, B. Plaçais, D. C. Glattli, Mahn-Soo Choi, C. Mora, T. Kontos

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

In the original discussion of the Kondo effect, the increase of the resistance in an alloy such as Cu 0.998 Fe 0.002 at low temperature was explained by the antiferromagnetic coupling between a magnetic impurity and the spin of the hosts conduction electrons. This coupling has since emerged as a very generic property of localized electronic states coupled to a continuum. Recently, the possibility to design artificial magnetic impurities in nanoscale conductors has opened avenues to the study of this many-body phenomenon in a controlled way and, in particular, in out-of-equilibrium situations. So far though, measurements have focused on the average current. Current fluctuations (noise) on the other hand are a sensitive probe that contains detailed information about electronic transport. Here, we report on noise measurements in artificial Kondo impurities realized in carbon-nanotube devices. We find a striking enhancement of the current noise within the Kondo resonance, in contradiction with simple non-interacting theories. Our findings provide a sensitive test bench for one of the most important many-body theories of condensed matter in out-of-equilibrium situations and shed light on the noise properties of highly conductive molecular devices.

Original languageEnglish
Pages (from-to)208-212
Number of pages5
JournalNature Physics
Volume5
Issue number3
DOIs
Publication statusPublished - 2009 Mar 1

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impurities
sheds
Kondo effect
noise measurement
electronics
conduction electrons
seats
conductors
carbon nanotubes
continuums
augmentation
probes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Delattre, T., Feuillet-Palma, C., Herrmann, L. G., Morfin, P., Berroir, J. M., Fève, G., ... Kontos, T. (2009). Noisy Kondo impurities. Nature Physics, 5(3), 208-212. https://doi.org/10.1038/nphys1186

Noisy Kondo impurities. / Delattre, T.; Feuillet-Palma, C.; Herrmann, L. G.; Morfin, P.; Berroir, J. M.; Fève, G.; Plaçais, B.; Glattli, D. C.; Choi, Mahn-Soo; Mora, C.; Kontos, T.

In: Nature Physics, Vol. 5, No. 3, 01.03.2009, p. 208-212.

Research output: Contribution to journalArticle

Delattre, T, Feuillet-Palma, C, Herrmann, LG, Morfin, P, Berroir, JM, Fève, G, Plaçais, B, Glattli, DC, Choi, M-S, Mora, C & Kontos, T 2009, 'Noisy Kondo impurities', Nature Physics, vol. 5, no. 3, pp. 208-212. https://doi.org/10.1038/nphys1186
Delattre T, Feuillet-Palma C, Herrmann LG, Morfin P, Berroir JM, Fève G et al. Noisy Kondo impurities. Nature Physics. 2009 Mar 1;5(3):208-212. https://doi.org/10.1038/nphys1186
Delattre, T. ; Feuillet-Palma, C. ; Herrmann, L. G. ; Morfin, P. ; Berroir, J. M. ; Fève, G. ; Plaçais, B. ; Glattli, D. C. ; Choi, Mahn-Soo ; Mora, C. ; Kontos, T. / Noisy Kondo impurities. In: Nature Physics. 2009 ; Vol. 5, No. 3. pp. 208-212.
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