Mechanism of current noise spectrum in a nonequilibirum Kondo dot system

Abstract

We systematically study the nonequilibirum Kondo mechanisms of quantum noise spectrum based on the accurate dissipaton--equation--of--motion evaluations. By comparing the noise spectra between the equilibrium and nonequilibrium cases and between the non-Kondo and Kondo regimes, we identify the nonequilibrium Kondo features in the current noise spectrum, appearing in the region of $\omega \in [-eV,eV]$. The Kondo characteristic at $\omega =\pm eV=\pm ({\mu }_{\mathrm{L}}-{\mu }_{\mathrm{R}})$ display asymmetrical upturns and remarkable peaks in $S(\omega )$ and $dS(\omega )/d\omega$, respectively. These features are originated from the Rabi interference of the transport current dynamics, with the Kondo oscillation frequency of $|eV|$. The minor but very distinguishable inflections, crossing over $\omega =-eV$ to $\omega =+eV$, would be related to a sort of Kondo-Fano interference between two Kondo resonances channels.

7 pages, 3 figures

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• Dynamic Transport Characteristics of Side-Coupled Double Quantum-Impurity Systems