Nonlinear Transport Properties of Quantum Dots

Details Nonlinear Transport Properties of Quantum Dots Nonlinear Transport Properties of Quantum Dots

1993-06-23

arxiv.org/abs/cond-mat/9306050v1

Physics

Condensed Matter

11 pages (excl. Figures), 3 Figures are available on request, RevTeX

Scientific paper

10.1007/BF01313284

The influence of excited levels on nonlinear transport properties of a quantum dot weakly coupled to leads is studied using a master--equation approach. A charging model for the dot is compared with a quantum mechanical model for interacting electrons. The current--voltage curve shows Coulomb blockade and additional finestructure that is related to the excited states of the correlated electrons. Unequal coupling to the leads causes asymmetric conductance peaks. Negative differential conductances are predicted due to the existence of excited states with different spins.

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