Study of transport properties of a molecular junction as a function of distance between the leads

Abstract

We consider a model of a molecular junction made of BDT (benzene dithiol) molecule trapped between two Au(100) leads. Using the ab initio approach implemented in the SIESTA package we look for the optimal configuration of the molecule as a function of a distance between the leads. We find that for the distance long enough the energy of the system is minimized when the molecule is bonded asymmetricaly, i.e. chemisorbed to one of the leads, whereas for the distance shorter than 12 Åthe energy is minimized for the molecule sitting in the middle between the leads. We discuss possible consequences of the above findings for the transport properties of the junction.

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Cited by in corpus (7)

• Advances and challenges in single-molecule electron transport
• Giant thermopower and figure of merit in single-molecule devices
• Density functional calculations of nanoscale conductance
• Conformation dependence of molecular conductance: chemistry versus geometry
• First-principles scheme for spectral adjustment in nanoscale transport
• Electronic structure of the Au/benzene-1,4-dithiol/Au transport interface: Effects of chemical bonding
• Tailoring the Fermi level of the leads in molecular-electronic devices