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• W2024052836 abstract "We explore theoretically the scanning tunneling microscopy (STM) of single molecules on substrates using a framework of two local probes. This framework is appropriate for studying electron flow in tip-molecule-substrate systems where a thin insulating layer between the molecule and a conducting substrate transmits electrons nonuniformly and thus confines electron transmission between the molecule and substrate laterally to a nanoscale region significantly smaller in size than the molecule. The tip-molecule coupling and molecule-substrate coupling are treated on the same footing, as local probes to the molecule, with electron flow modelled using the Lippmann-Schwinger Green-function scattering technique. STM images are simulated for various positions of the stationary (substrate) probe below a Zn(II)-etioporphyrin I molecule. We find that these images have a strong dependence on the substrate probe position, indicating that electron flow can depend strongly on both tip position and the location of the dominant molecule-substrate coupling. Differences in the STM images are explained in terms of the molecular orbitals that mediate electron flow in each case. Recent experimental results, showing STM topographs of Zn(II)-etioporphyrin I on $text{alumina}∕mathrm{NiAl}(110)$ to be strongly dependent on which individual molecule on the substrate is being probed, are explained using this model. A further experimental test of the model is also proposed." @default.
• W2024052836 created "2016-06-24" @default.
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• W2024052836 date "2005-11-29" @default.
• W2024052836 modified "2023-09-23" @default.
• W2024052836 title "Two-probe theory of scanning tunneling microscopy of single molecules: Zn(II)-etioporphyrin on alumina" @default.
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• W2024052836 doi "https://doi.org/10.1103/physrevb.72.205338" @default.
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