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We study the electron transport in open quantum-dot systems described by theinteracting resonant-level models with Coulomb interactions. We consider thesituation in which the quantum dot is connected to the left and right leadsasymmetrically. We exactly construct many-electron scattering eigenstates forthe two-lead system, where two-body bound states appear as a consequence ofone-body resonances and the Coulomb interactions. By using an extension of theLandauer formula, we calculate the average electric current for the systemunder bias voltages in the first order of the interaction parameters. Through arenormalization-group technique, we arrive at the universal electric current,where we observe the suppression of the electric current for large biasvoltages, i.e., negative differential conductance. We find that the suppressedelectric current is restored by the asymmetry of the system parameters.

Universal electric current of interacting resonant-level models with asymmetric interactions: An extension of the Landauer formula