Noisy Kondo impurities

Abstract

The anti-ferromagnetic coupling of a magnetic impurity carrying a spin with the conduction electrons spins of a host metal is the basic mechanism responsible for the increase of the resistance of an alloy such as Cu${}_{0.998}$Fe${}_{0.002}$ at low temperature, as originally suggested by Kondo . This coupling has emerged as a very generic property of localized electronic states coupled to a continuum . The possibility to design artificial controllable magnetic impurities in nanoscopic conductors has opened a path to study this many body phenomenon in unusual situations as compared to the initial one and, in particular, in out of equilibrium situations. So far, measurements have focused on the average current. Here, we report on \textit{current fluctuations} (noise) measurements in artificial Kondo impurities made 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 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.

minor differences with published version

References in corpus (10)

• Orbital Kondo effect in carbon nanotubes
• Universal Scaling in Non-equilibrium Transport Through a Single-Channel Kondo Dot
• Nonequilibrium Singlet-Triplet Kondo Effect in Carbon Nanotubes
• Evolution of SU(4) Transport Regimes in Carbon Nanotube Quantum Dots
• Kondo Effects in Carbon Nanotubes: From SU(4) to SU(2) symmetry
• Two-electron bunching in transport through a QD induced by Kondo correlations
• Full counting statistics for the Kondo dot in the unitary limit
• Current noise through a Kondo quantum dot in a SU(N) Fermi liquid state
• Transport through a quantum dot with SU(4) Kondo entanglement
• Shot Noise in SU(N) Quantum Dot Kondo Effects

Cited by in corpus (75)

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• Non-equilibrium frequency-dependent noise through a quantum dot: A real time functional renormalization group approach
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• Effective Equilibrium Theory of Nonequilibrium Quantum Transport
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• Suppression of Shot Noise in a Dirty Marginal Fermi Liquid
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• Role of bias and tunneling asymmetries in nonlinear Fermi-liquid transport through an SU($N$) quantum dot
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• Mesoscopic features in the transport properties of a Kondo-correlated quantum dot in a magnetic field
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• Kondo Phase Transitions of Magnetic Impurities in Carbon Nanotubes
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