V. M. Garc\'\ia-Suárez, R. Ferradás, D. Carrascal, J. Ferrer
We analyse the transport response of large molecular wires bridging graphene electrodes, where the molecules are physisorbed onto the graphene sheets. In our study, the sheets are pulled away to vary the gap length and the relative atomic positions. The molecular wires are also translated in directions parallel and perpendicular to the sheets. We show that the energy position of the molecular resonances is universal for a given molecule, in the sense that it is independent of the details of the graphene edges, gaps lengths or of the molecule positions. Although the junctions discussed here show a large variability in the zero-bias conductance, we suggest that this variability can be reduced drastically by suitably tuning the energy position of the HOMO or LUMO resonances to low enough energies.
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http://arxiv.org/abs/1303.1386
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