| TIME-DEPENDENT TRANSPORT THROUGH A QUANTUM DOT: MEAN-FIELD TREATMENT OF THE COULOMB INTERACTION |
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T. Kwapiński, R. Taranko and E. Taranko Institute of Physics, M. Curie-Skłodowska University, Pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland |
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| Received: August 1, 2000; revised version December 12, 2000 |
| We study an electron transport through a quantum dot in the presence of time-dependent fields. The dot is described by a single level and the intra-dot Coulomb interaction is introduced within the Hartree-Fock approximation. The external fields cause a time-dependent shift of the energy spectrum of the leads and quantum dot. We take into account the spin-polarized solutions for the quantum dot charge. We calculated the time dependence of the current and charge accumulated on the dot, the average current and charge vs. the source-drain and gate voltages in dependence on the Coulomb interaction strength and the frequencies and amplitude of the external fields. |
| DOI: 10.12693/APhysPolA.99.293 PACS numbers: 85.30.Vw, 85.30.Wx |