Letter abstract
Nature Physics 5, 208 - 212 (2009)
Published online: 25 January 2009 | doi:10.1038/nphys1186
Subject Categories: Condensed-matter physics | Nanotechnology
Noisy Kondo impurities
T. Delattre1,2, C. Feuillet-Palma1,2, L. G. Herrmann1,2, P. Morfin1,2, J.-M. Berroir1,2, G. Fève1,2, B. Plaçais1,2, D. C. Glattli1,2,3, M.-S. Choi4, C. Mora1,2 & T. Kontos1,2
In the original discussion of the Kondo effect, the increase of the resistance in an alloy such as Cu0.998Fe0.002 at low temperature was explained by the antiferromagnetic coupling between a magnetic impurity and the spin of the host's conduction electrons1. This coupling has since emerged as a very generic property of localized electronic states coupled to a continuum2, 3, 4, 5, 6, 7. 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 situations8, 9, 10. 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.
- Ecole Normale Supérieure, Laboratoire Pierre Aigrain, 24, rue Lhomond, 75231 Paris Cedex 05, France
- CNRS UMR 8551, Laboratoire associé aux universités Pierre et Marie Curie et Denis Diderot, France
- Service de physique de l'état Condensé, CEA, 91192 Gif-sur-Yvette, France
- Department of Physics, Korea University, Seoul 136-713, Korea
Correspondence to: T. Kontos1,2 e-mail: kontos@lpa.ens.fr
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