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Over-screened Kondo effect is feasible in carbon nanotube quantum dotjunction hosting a spin $\tfrac{1}{2}$ atom with single $s$-wave valenceelectron (e.g Au). The idea is to use the two valleys as two symmetry protectedflavor quantum numbers $\xi={\bf K}, {\bf K}'$. Perturbative RG analysisexposes the finite weak-coupling two-channel fixed point, where the Kondotemperature is estimated to be around $0.5\div5$~K. Remarkably, occurrence oftwo different scaling regimes implies a non-monotonic dependence of theconductance as function of temperature.

A Model for Two-Channel Kondo Effect in CNT Quantum Dot