Current and noise in a model of an alternating current scanning tunneling microscope molecule-metal junction

R. Guyon, T. Jonckheere, Vladimiro Mujica, A. Cŕpieux, T. Martin

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The 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 photoassisted 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 photoassisted 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.

Original languageEnglish
Article number144703
JournalJournal of Chemical Physics
Volume122
Issue number14
DOIs
Publication statusPublished - 2005

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alternating current
Microscopes
Metals
microscopes
Scanning
Molecules
scanning
Shot noise
metals
molecules
shot noise
Molecular electronics
molecular electronics
Transport properties
Electron energy levels
Semiconductor quantum dots
transport properties
energy levels
quantum dots
harmonics

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Current and noise in a model of an alternating current scanning tunneling microscope molecule-metal junction. / Guyon, R.; Jonckheere, T.; Mujica, Vladimiro; Cŕpieux, A.; Martin, T.

In: Journal of Chemical Physics, Vol. 122, No. 14, 144703, 2005.

Research output: Contribution to journalArticle

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