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From first-principles approaches, we illustrate that the current-inducedforces and the selection rule for inelastic effects are highly relevant to thecurrent density in an asymmetric molecular junction. The curved flow of currentstreamline around the asymmetric molecule may induce a net torque, which tendsto rotate the benzene molecule, similar to the way a stream of water rotates awaterwheel. Thus, the Pt/benzene junction offers a practical system in theexploration of the possibility of atomic-scale motors. We also enumerateexamples to show that the use of selection rule can lead to misjudgement of theimportance of normal modes in the inelastic profiles when the detailedinformation about the current density is not considered.

Current Streamline Flow on Current-induced Effects in Highly Asymmetric Molecular Junctions