Cumulene Molecular Wire Conductance from First Principles

Details Cumulene Molecular Wire Conductance from First Principles Cumulene Molecular Wire Conductance from First Principles

2010-01-27

arxiv.org/abs/1001.4934v3

Physical Review B, vol. 81, Issue 11, p. 115404, 2010

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Accepted in Phys. Rev. B; 5 pages and 6 figures

Scientific paper

10.1103/PhysRevB.81.115404

We present first principles calculations of current-voltage characteristics (IVC) and conductance of Au(111):S2-cumulene-S2:Au(111) molecular wire junctions with realistic contacts. The transport properties are calculated using full self-consistent ab initio NEGF-DFT methods under external bias. The conductance of the cumulene wires shows oscillatory behavior depending on the number of carbon atoms (double bonds). Among all conjugated oligomers, we find that cumulene wires with odd number of carbon atoms yield the highest conductance with metallic-like ballistic transport behavior. The reason is the high density of states in broad LUMO levels spanning the Fermi level of the electrodes. The transmission spectrum and the conductance depend only weakly on applied bias, and the IVC is nearly linear over a bias region from +1 to -1 V. Cumulene wires are therefore potential candidates for metallic connections in nanoelectronic applications.

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