High-order current correlation functions in Kondo systems

Abstract

We examine the statistics of current fluctuations in a junction with a quantum dot described by Kondo Hamiltonian. With the help of modified Keldish technique we calculate the third current cumulant. As a function of ratio $v=eV/T_K$ the 3rd cumulant was obtained for three different regimes: Fermi liquid regime (v<1), crossover interval ($v\ge 1$) and RG limit (v>>1). Unlike the case of noninteracting dot, 3rd cumulant shows strong non-linear voltage dependence. Only in the asymptotical limit of large voltages the linear dependence on $V$ is recovered.

5 pages, 2 figures

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Cited by in corpus (2)

• Measurement of high order current correlators
• Full counting statistics of Kondo-type tunneling in a quantum dot: the fluctuation effect of Slave-Boson field