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In this work we study the role of bound electrons in quantum transport. Thepartition-free approach by Cini is combined with time-dependent densityfunctional theory (TDDFT) to calculate total currents and densities ininteracting systems. We show that the biased electrode-device-electrode systemwith bound states does not evolve towards a steady regime. The densityoscillates with history-dependent amplitudes and, as a consequence, theeffective potential of TDDFT oscillates too. Such time dependence might opennew conductive channels, an effect which is not accounted for in anysteady-state approach and might deserve further investigations.Comment: 11 pages, 2 eps figure

Bound states inab initioapproaches to quantum transport: A time-dependent formulation