Nonlinear transport at the strong intra-dot Coulomb interaction

Abstract

Nonlinear transport is studied in the limit of weak and strong intra-dot Coulombinteraction. The nonequilibrium self-consistent mean-field equations for one-electrontransition energies of an open dot and their spectral weights are derived at the strongCoulomb interaction. In this limit populations of states involved in tunnelling equalizeupon the increase of the bias-voltage window even at low temperature. This resultsin a simple analytical relation between the heights of the current steps and thedegeneracy of a spectrum in a two-dimensional parabolic dot in a magnetic field.