Emission Noise and High Frequency Cut-Off of the Kondo Effect in a Quantum Dot

Abstract

By coupling on chip a carbon nanotube to a quantum noise detector, a superconductor-insulator-superconductor junction, via a resonant circuit, we measure the emission noise of a carbon nanotube quantum dot in the Kondo regime. The signature of the Kondo effect in the current noise is measured for different ratios of the Kondo temperature over the measured frequency and for different asymmetries of the coupling to the contacts, and compared to finite frequency quantum noise calculations. Our results point towards the existence of a high frequency cut-off of the electronic emission noise associated with the Kondo resonance. This cut-off frequency is of the order of a few times the Kondo temperature when the electronic system is close to equilibrium, which is the case for a strongly asymmetric coupling. On the other hand, this cut-off is shifted to lower frequency in a symmetric coupling situation, where the bias voltage drives the Kondo state out-of-equilibrium. We then attribute the low frequency cut-off to voltage induced spin relaxation.

arXiv comment5 pages, 3 figures and appendix

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• Magnetic field independent sub-gap states in hybrid Rashba nanowires
• Nanomechanical characterization of the Kondo charge dynamics in a carbon nanotube
• Multi-terminal far-from-equilibrium thermoelectric nano-devices in the Kondo regime
• Emission Noise in an Interacting Quantum Dot: Role of Inelastic Scattering and Asymmetric Coupling to the Reservoirs
• Nonlinear Seebeck effect of SU($N$) Kondo impurity
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