Measurement of Quantum Noise in a Carbon Nanotube Quantum Dot in the Kondo Regime

Basset, J. and Kasumov, A. Y. and Moca, C. P. and Zaránd, Gergely Attila and Simon, P. (2012) Measurement of Quantum Noise in a Carbon Nanotube Quantum Dot in the Kondo Regime. PHYSICAL REVIEW LETTERS, 108 (4). Paper-046802. ISSN 0031-9007

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Abstract

The current emission noise of a carbon nanotube quantum dot in the Kondo regime is measured at frequencies nu of the order or higher than the frequency associated with the Kondo effect k(B)T(K)/h, with T-K the Kondo temperature. The carbon nanotube is coupled via an on-chip resonant circuit to a quantum noise detector, a superconductor-insulator-superconductor junction. We find for h nu approximate to k(B)T(K) a Kondo effect related singularity at a voltage bias eV approximate to h nu, and a strong reduction of this singularity for h nu approximate to 3k(B)T(K), in good agreement with theory. Our experiment constitutes a new original tool for the investigation of the nonequilibrium dynamics of many-body phenomena in nanoscale devices.

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