Singlet-Triplet Kondo effect in a quantum dot with dissipation

We studied the singlet-triplet Kondo effect in a carbon nanotube contacted by resistive leads which form dissipative baths. With dissipation parameter r $\approx $ 0.5, the conventional spin $\mbox{1/2}$ Kondo resonances in odd electron valleys are strongly suppressed. However, the singlet-triplet Kondo effect induced by applying perpendicular magnetic field in a 2-electron valley appears to survive. The resonance demonstrates an unusual dependence on the side gate voltage, being enhanced in a particular part of the phase space. We also report on the peculiar dependence of the resonance on bias voltage.