Charging Effects in Ultrasmall Quantum Dots in the Presence of Time-Varying Fields

Details Charging Effects in Ultrasmall Quantum Dots in the Presence of Time-Varying Fields Charging Effects in Ultrasmall Quantum Dots in the Presence of Time-Varying Fields

1993-06-15

arxiv.org/abs/cond-mat/9306033v1

Physics

Condensed Matter

9 Pages Revtex. 3 postscript figures available on request from bruder@tfp.physik.uni-karlsruhe.de

Scientific paper

10.1103/PhysRevLett.72.1076

The influence of charging effects on time-dependent transport in small semiconductor 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.

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