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We analyze the nonequilibrium transport properties of a parallel doublequantum dot in terms of its full counting statistics (FCS). The parameters ofthe setup are assumed to be such that both subsystems are driven into the Kondoregime. After a series of transformations the Hamiltonian is then mapped onto aMajorana resonant level model, which effectively describes the Toulouse pointof the respective double impurity two-terminal Kondo model. Its FCS is thenobtained at arbitrary constellation of voltage, temperature, and local magneticfields. We identify two different transport processes corresponding to singleelectron tunneling as well as an electron pair process and give the respectiveeffective transport coefficients. In the most universal linear response regimethe FCS turns out to be of a binomial shape with an effective transmissioncoefficient. Furthermore, we find a complete transport suppression(antiresonance) at a certain parameter constellation, which is similar to theone found in the noninteracting quantum dots. By an explicit expansion aroundthe Toulouse point we show that the antiresonance is universal and should beobservable in the generic Kondo dot setup. We discuss experimental implicationsof our predictions as well as possible routes for generalizations of ourapproach.

Nonequilibrium transport properties of a double quantum dot in the Kondo regime