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.
Bibliographical noteFunding Information:
We thank A. Cottet for a critical reading of the manuscript and K. Le Hur, P. Simon, L. Glazman and N. Regnault for illuminating discussions. This work is supported by the SRC (R11-2000-071) contract, the BK21 contract, the ANR-05-NANO-055 contract, the EU contract FP6-IST-021285-2 and by the C’Nano Ile de France contract SPINMOL.
ASJC Scopus subject areas
- Physics and Astronomy(all)