Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-05-21
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 4 figures. To appear in PRB
Scientific paper
Transition voltage spectroscopy (TVS) has recently been introduced as a spectroscopic tool for molecular junctions where it offers the possibility to probe molecular level energies at relatively low bias voltages. In this work we perform extensive ab-initio calculations of the non-linear current voltage relations for a broad class of single-molecule transport junctions in order to assess the applicability and limitations of TVS. We find, that in order to fully utilize TVS as a quantitative spectroscopic tool, it is important to consider asymmetries in the coupling of the molecule to the two electrodes. When this is taken properly into account, the relation between the transition voltage and the energy of the molecular orbital closest to the Fermi level closely follows the trend expected from a simple, analytical model.
Chen Jingzhe
Markussen Troels
Thygesen Kristian S.
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