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Various causes for negative differential conductance in transport through aninteracting double quantum dot are investigated. Particular focus is given tothe interplay between the renormalization of the energy levels due to thecoupling to the leads and the decoherence of the states. The calculations areperformed within a basis of many-particle eigenstates and we consider thedynamics given by the von Neumann-equation taking into account also processesbeyond sequential tunneling. A systematic comparison between the levels ofapproximation and also with different formalisms is performed. It is found thatthe current is qualitatively well described by sequential processes as long asthe temperature is larger than the level broadening induced by the contacts.Comment: 11 pages, 5 figures included in tex

Coherent transport through an interacting double quantum dot: Beyond sequential tunneling