Abstract
Nonlinear transport through a quantum dot attached to two metallic contacts is studied in the limit of a weak and a strong intradot Coulomb interaction. The nonequilibrium self-consistent mean-field equations for the energies and spectral weights of one-electron transitions are formulated in the strong-interaction regime. The self-consistent solutions result in a decrease of bias voltage threshold for nonzero current, contrary to the weak case. With an increase of the bias voltage window, the solutions lead to a significant deviation from the Gibbs statistics: the populations of states involved in tunneling are equalizing even at low temperatures. For a symmetric dot-contact coupling we obtain simple analytical relations between the heights of the current steps and degeneracies of a spectrum of a circular dot in a perpendicular magnetic field, in both regimes.
Published Version
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