Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-03-24
Physics
Condensed Matter
Strongly Correlated Electrons
40 preprint pages, 6 figures
Scientific paper
Nonlinear transport through a quantum dot is studied in the limit of weak and strong intra-dot Coulomb interaction. For the latter regime the nonequilibrium self-consistent mean field equations for energies and spectral weights of one-electron transitions are formulated. The increase of the bias-voltage window leads to a strong deviation from Gibbs statistics: the populations of states involved into a tunnelling are equalizing in this limit even at low temperature. For a symmetric coupling of a quantum dot to two leads we provide simple analytical relations between heights of the current steps and degeneracy of a spectrum in a two-dimensional parabolic dot in a perpendicular magnetic field in the both regimes.
Nazmitdinov Rashid G.
Sandalov Igor
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