Non-equilibrium frequency-dependent noise through a quantum dot: A real time functional renormalization group approach

Abstract

We construct a real time current-conserving functional renormalization group (RG) scheme on the Keldysh contour to study frequency-dependent transport and noise through a quantum dot in the local moment regime. We find that the current vertex develops a non-trivial non-local structure in time, governed by a new set of RG equations. Solving these RG equations, we compute the complete frequency and temperature-dependence of the noise spectrum. For voltages large compared to the Kondo temperature, $eV\gg k_B{T}_K$, two sharp anti-resonances are found in the noise spectrum at frequencies $\hslash \omega =\pm eV$, and correspondingly, two peaks in the ac conductance through the dot.

4 pages, 4 figures

References in corpus (7)

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• Nonequilibrium Singlet-Triplet Kondo Effect in Carbon Nanotubes
• Dynamics of Quantum Noise in a Tunnel Junction under ac Excitation
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