Control of relative tunneling rates in single molecule bipolar electron transport

The influence of relative electron tunneling rates on electron transport in a double-barrier single-molecule junction is studied. The junction is defined by positioning a scanning tunneling microscope tip above a copper phthalocyanine molecule adsorbed on a thin oxide film grown on the NiAl(110) sur...

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Bibliographic Details
Published in:Physical review letters 2004-12, Vol.93 (23), p.236802.1-236802.4, Article 236802
Main Authors: WU, S. W, NAZIN, G. V, CHEN, X, QIU, X. H, HO, W
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in interface structures
Electronic transport in mesoscopic or nanoscale materials and structures
Electronic transport in multilayers, nanoscale materials and structures
Exact sciences and technology
Physics
Tunneling
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Summary:The influence of relative electron tunneling rates on electron transport in a double-barrier single-molecule junction is studied. The junction is defined by positioning a scanning tunneling microscope tip above a copper phthalocyanine molecule adsorbed on a thin oxide film grown on the NiAl(110) surface. By tuning the tip-molecule separation, the ratio of tunneling rates through the two barriers, vacuum and oxide, is controlled. This results in dramatic changes in the relative intensities of individual conduction channels, associated with different vibronic states of the molecule.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.93.236802