Inelastic electron tunneling spectroscopy in molecular junctions

Peaks and dips

Michael Galperin, Mark A Ratner, Abraham Nitzan

Research output: Contribution to journalArticle

268 Citations (Scopus)

Abstract

We study inelastic electron tunneling through a molecular junction using the nonequilibrium Green's function formalism. The effect of the mutual influence between the phonon and the electron subsystems on the electron tunneling process is considered within a general self-consistent scheme. Results of this calculation are compared to those obtained from the simpler Born approximation and the simplest perturbation theory approaches, and some shortcomings of the latter are pointed out. The self-consistent calculation allows also for evaluating other related quantities such as the power loss during electron conduction. Regarding the inelastic spectrum, two types of inelastic contributions are discussed. Features associated with real and virtual energy transfer to phonons are usually observed in the second derivative of the current I with respect to the voltage φ when plotted against $. Signatures of resonant tunneling driven by an intermediate molecular ion appear as peaks in the first derivative dI/dφ and may show phonon sidebands. The dependence of the observed vibrationally induced lineshapes on the junction characteristics, and the linewidth associated with these features are also discussed.

Original languageEnglish
Article number15
Pages (from-to)11965-11979
Number of pages15
JournalJournal of Chemical Physics
Volume121
Issue number23
DOIs
Publication statusPublished - Dec 15 2004

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Electron tunneling
electron tunneling
Spectroscopy
Derivatives
Born approximation
Resonant tunneling
Electrons
power loss
resonant tunneling
Phonons
molecular ions
sidebands
Green's function
Linewidth
conduction electrons
Energy transfer
spectroscopy
phonons
Green's functions
perturbation theory

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Inelastic electron tunneling spectroscopy in molecular junctions : Peaks and dips. / Galperin, Michael; Ratner, Mark A; Nitzan, Abraham.

In: Journal of Chemical Physics, Vol. 121, No. 23, 15, 15.12.2004, p. 11965-11979.

Research output: Contribution to journalArticle

Galperin, Michael ; Ratner, Mark A ; Nitzan, Abraham. / Inelastic electron tunneling spectroscopy in molecular junctions : Peaks and dips. In: Journal of Chemical Physics. 2004 ; Vol. 121, No. 23. pp. 11965-11979.
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