Current and noise in a model of an AC-STM molecule-metal junction

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dc.creatorGuyon, R.
dc.creatorJonckheere, T.
dc.creatorMujica, V.
dc.creatorCrepieux, A.
dc.creatorMartin, T.
dc.date2004-04-23
dc.date.accessioned2026-07-07T02:57:47Z
dc.date.available2026-07-07T02:57:47Z
dc.descriptionThe transport properties of a simple model for a finite level structure (a molecule or a dot) connected to metal electrodes in an alternating current scanning tunneling microscope (AC-STM) configuration is studied. The finite level structure is assumed to have strong binding properties with the metallic substrate, and the bias between the STM tip and the hybrid metal-molecule interface has both an AC and a DC component. The finite frequency current response and the zero frequency photo-assisted shot noise are computed using the Keldysh technique, and examples for a single site molecule (a quantum dot) and for a two-site molecule are examined. The model may be useful for the interpretation of recent experiments using an AC-STM for the study of both conducting and insulating surfaces, where the third harmonic component of the current is measured. The zero frequency photo-assisted shot noise serves as a useful diagnosis for analyzing the energy level structure of the molecule. The present work motivates the need for further analysis of current fluctuations in electronic molecular transport.
dc.description13 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0404571
dc.identifierhttp://arxiv.org/abs/cond-mat/0404571
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/23809
dc.subjectMesoscale and Nanoscale Physics
dc.titleCurrent and noise in a model of an AC-STM molecule-metal junction
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