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

Gergely Zaránd (TU Budapest)

22.06.2012 at 10:15 

We show how time dependent correlations can be computed in a functional renormalization group scheme and apply this formalism to study the noise through a quantum dot. The results are compared to experiments, where the current emission noise of a carbon nanotube quantum dot in the Kondo regime is measured at frequencies ν of the order or higher than the frequency associated with the Kondo effect, kBTK/h, with TK the Kondo temperature. The carbon nanotube is coupled via an on-chip resonant circuit to a quantum noise detector. A Kondo effect related singularity at a voltage bias eV≈hν and a strong reduction of this singularity for hν≈3kBTK is found, in good agreement with theory.

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