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Charging effects in ultrasmall quantum dots in the presence of time-varing fields

1994; American Physical Society; Volume: 72; Issue: 7 Linguagem: Inglês

10.1103/physrevlett.72.1076

1092-0145

Christoph Bruder, Herbert Schoeller,

Quantum Information and Cryptography

The influence of charging effects on time-dependent transport in small semicondutor quantum dots with arbitrary level spectra is studied. Starting from an explicit time-dependent tunneling Hamiltonian, a non-Markovian master equation is derived which is also valid in the nonlinear response regime. The many-body nonequilibrium distribution functions of the dot are calculated and the I-V characteristic of the structure including the displacement currents is obtained. New resonant features show up in the Coulomb oscillations and in the Coulomb staircase, and a new possibility to realize electronic pumps is described.