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In this Letter we investigate the properties of a quantum impurity model inthe presence of additional many-body interactions between mobile carriers. Thefundamental question which is addressed here is how the interactions in thecharge and spin sectors of an itinerant system affect the quantum impurityphysics in the vicinity of the intermediate coupling fixed point. To illustratethe general answer to this question we discuss a two-channel charge Kondocircuit model. We show that the electron-electron interactions resulting in theformation of a massive spin mode in an itinerant electron subset drive thesystem away from the unstable non-Fermi liquid (NFL) fixed point to the stableFermi liquid (FL) regime. We discuss the thermoelectric response as a benchmarkfor the NFL-FL crossover.

Thermoelectrics of a two-channel charge Kondo circuit: Role of electron-electron interactions in a quantum point contact