Impact of Coulomb interaction and Kondo effect on shot noise in quantum dots

We examine the impact of Coulomb electron-electron interaction on transport in a junction with a quantum dot described by Kondo Hamiltonian. We analyze the Fermi liquid regime and consider the limit of zero temperature. With the help of Keldysh technique we calculate the nonlinear current and shot noise as a function of applied voltage. We show that Coulomb interaction markable influences the universal effective charge of current-carrying particles e* = 5/3e which can be measured in shot-noise experiments. The electron-electron interaction modifies this universal value by a factor (e* = 5/3eF) which is less then one and also voltage dependent.