Theory of Inelastic Electron-Molecule Interactions in Tunnel Junctions

Scalapino, D. J.; Marcus, S.M.

doi:10.1103/physrevlett.18.459

Cited by 175 publications

(40 citation statements)

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“…A model calculation (ref. 3), in which the electron-molecule interaction is taken into account by including the molecular dipole field in the potential describing the b a r r i e r region, is in good agreement with experimental observation. This report presents a calculation based on the s a m e kind of model for the case of field emission into a vacuum from a metal with a molecular layer on its surface.…”

Section: Ntro Duct1 Cnsupporting

confidence: 73%

Molecular Vibration Spectra from Field-Emission Energy Distributions

Flood

1970

The Journal of Chemical Physics

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A calculation is presented which predicts the effect of an inelastic interaction between field-emitted electrons and adsorbed molecules at a metal–vacuum interface. The derivative of the total energy distribution of the field-emission current should yield information on the infrared absorption spectra of the adsorbed molecules. A numerical estimate of the size of the effect indicates that changes on the order of 1% of the total current should occur.

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Section: Ntro Duct1 Cnsupporting

confidence: 73%

Molecular Vibration Spectra from Field-Emission Energy Distributions

Flood

1970

The Journal of Chemical Physics

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“…1(c) attributed to the Au-N bond and obviously correlated to the electronic transport within the layer. Typically in IETS, the position, width, and intensity of the peaks contain information about the underlying process during the el-ph interaction [55][56][57][58][59][60][61][62]. It is well established that the peaks width of the d 2 I/dV 2 spectra is related to an intrinsic linewidth associated to the molecular structure (W i ) and broadening effects associated to the experimental conditions (thermal broadening and instrumental broadening) [58][59][60][61][62].…”

Section: Aq Junctions Transport Measurementsmentioning

confidence: 99%

Inelastic electron tunneling spectroscopy in molecular junctions showing quantum interference

et al. 2017

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Destructive quantum interference effect is implemented in large area molecular junctions to improve signatures of electron-phonon interaction. Vertical molecular junctions based on a cross-conjugated anthraquinone layer were fabricated and low-noise transport measurements were performed by acquiring simultaneously the current-voltage characteristics, its second derivative, and the differential conductance. Signatures of vibrational modes excited by inelastic events are present in the whole measured voltage range and superpose to the conductance suppression induced by destructive quantum interference. As a consequence vibrational modes have improved visibility in the low energy window (<80 meV). Inelastic electron transport spectroscopy data are compared to infrared attenuated total reflection spectroscopy on Au/anthraquinone thin films. Common vibrational modes can be clearly identified, but inelastic electron tunneling spectroscopy reveals the existence of vibrational modes in a wider energy range (0-400 meV) where infrared spectroscopy is lacking.

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“…In this letter we examine an alternative explanation in terms of inelastic tunneling processes. Such inelastic processes are well established in electron tunneling spectroscopy [13,14,15,16] of metal-insulator-metal junctions and in STM spectra taken on metals with adsorbed molecules [17,18]. In cleaved BSSCO the topmost layer is the BiO-plane, but the electrons tunnel into and out of the CuO 2 -planes.…”

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confidence: 99%

Role of Inelastic Tunneling through the Insulating Barrier in Scanning-Tunneling-Microscope Experiments on Cuprate Superconductors

Pilgram

Rice²,

Sigrist³

2006

Phys. Rev. Lett.

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The tunneling path between the CuO2-layers in cuprate superconductors and a scanning tunneling microscope tip passes through a barrier made from other oxide layers. This opens up the possibility that inelastic processes in the barrier contribute to the tunneling spectra. Such processes cause one or possibly more peaks in the second derivative current-voltage spectra displaced by phonon energies from the density of states singularity associated with superconductivity. Calculations of inelastic processes generated by apical O-phonons show good qualitative agreement with recent experiments reported by Lee et al. [1]. Further tests to discriminate between these inelastic processes and coupling to planar phonons are proposed.PACS numbers: 74.25.Kc,74.50.+r,68.37.Ef The importance of the electron-phonon interaction in the high temperature cuprate superconductors has long been a matter of debate. In conventional superconductors tunneling experiments analyzed by McMillan and Rowell [2] not only unequivocally established that the exchange of phonons between electrons is the underlying mechanism for Cooper pairing but also allowed its spectroscopic determination. In the case of cuprates there are many good reasons to doubt the dominance of an attraction due to phonon exchange. These reasons range from the d-wave rather than s-wave pairing symmetry, to their electronic structure as lightly doped Mott insulators. The latter points toward a strong onsite Coulomb repulsion which cannot be treated perturbatively, violating a key postulate in the standard BCS-Eliashberg theory. A number of proposals have been made for a subdominant role for the electron-phonon interactions particularly involving the half-buckling phonon modes which couple attractively in the d-wave pairing channel [3,4,5,6,7,8].Very recently, a new set of tunneling measurements at low temperatures has been reported by Lee et al. [1] using a STM (Scanning Tunneling Microscope). Results with this local tunneling probe show considerable variations in the form and energy of the density of states (DOS) singularity associated with the superconductivity and also a peak in the second derivative current-voltage spectra which is displaced from the DOS peak by a fairly constant energy. Lee et al. [1] report further that isotope substitution on the O-ions shifts this energy consistent with a phonon origin for this peak. This raises the question whether these spectra should be interpreted analogously to those of conventional superconductors or if these peaks have another source.A series of works explain the appearence of side peaks in the DOS of d-wave superconductors in terms of localized bosonic modes [9], resonant spin modes [10,11] or the breathing mode phonons [12]. All these proposals consider inelastic processes that happen directly in the superconducting plane. In this letter we examine an alternative explanation in terms of inelastic tunneling processes. Such inelastic processes are well established in electron tunneling spectroscopy [13,14,15,16] of metal-insu...

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Theory of Inelastic Electron-Molecule Interactions in Tunnel Junctions

Cited by 175 publications

References 3 publications

Molecular Vibration Spectra from Field-Emission Energy Distributions

Molecular Vibration Spectra from Field-Emission Energy Distributions

Inelastic electron tunneling spectroscopy in molecular junctions showing quantum interference

Role of Inelastic Tunneling through the Insulating Barrier in Scanning-Tunneling-Microscope Experiments on Cuprate Superconductors

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