High-order current correlation functions in the Kondo systems

We examine the statistics of current fluctuations in a junction with a quantum dot described by Kondo Hamiltonian. With the help of modified Keldysh technique we calculate the third current cumulant. As a function of ratio v=eV/TK the third cumulant was obtained for three different regimes: Fermi liquid regime (v<1), crossover interval (v≥1), and RG limit (v 1). Unlike the case of noninteracting dot, third momentum shows strong nonlinear voltage dependence. Only in the asymptotical limit v→∞ the linear dependence on V is recovered.