Electron transport through a molecular conductor with center-of-mass motion

The linear conductance of a molecular conductor oscillating between two metallic leads is investigated numerically both for Hubbard interacting and noninteracting electrons. The molecule-leads tunneling barriers depend on the molecule displacement from its equilibrium position. The results present a...

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Bibliographic Details
Published inPhysical review letters Vol. 95; no. 25; p. 256807
Main Authors Al-Hassanieh, K A, Büsser, C A, Martins, G B, Dagotto, E
Format Journal Article
LanguageEnglish
Published United States 16.12.2005
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Summary:The linear conductance of a molecular conductor oscillating between two metallic leads is investigated numerically both for Hubbard interacting and noninteracting electrons. The molecule-leads tunneling barriers depend on the molecule displacement from its equilibrium position. The results present an interesting interference which leads to a conductance dip at the electron-hole symmetry point that could be experimentally observable. It is shown that this dip is caused by the destructive interference between the purely electronic and phonon-assisted tunneling channels, which are found to carry opposite phases. When an internal vibrational mode is also active, the electron-hole symmetry is broken but a Fano-like interference is still observed.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.95.256807