Kondo Resonance in Transport Properties of Double Barrier Structure

Abstract

I consider the effect of the finite width of the resonant level on its thermodynamics and tunneling transport properties in the single electron charging regime. The finite width of the levels results from their delocalization with formation of a narrow band due to their mutual overlap. Making use of $1/N$ technique one can show that there is a fixed energy level position at which the system undergoes the transition from the Kondo regime (above this energy) to the paramagnetic regime (below it). The linear bias conductance calculated as a function of the chemical potential turns out to be suppressed all around except for the vicinity of the transition energy where it has an asymmetrical resonant behavior.