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  Unveiling mode-selected electron-phonon interactions in metal films by helium atom scattering

Benedek, G., Bernasconi, M., Bohnen, K. P., Campi, D., Chulkov, E. V., Echenique, P. M., et al. (2014). Unveiling mode-selected electron-phonon interactions in metal films by helium atom scattering. Physical Chemistry Chemical Physics, 16(16): 10.1039/C3CP54834A, pp. 7159-7172. doi:10.1039/c3cp54834a.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-0F75-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-0F76-C
Genre: Journal Article

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 Creators:
Benedek, G.1, Author              
Bernasconi, M., Author
Bohnen, K. P., Author
Campi, D., Author
Chulkov, E. V., Author
Echenique, P. M., Author
Heid, R., Author
Sklyandneva, I. Y., Author
Toennies, J. P.1, Author              
Affiliations:
1Emeritus Group Molecular Interactions, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063297              

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 Abstract: The quasi two-dimensional electron gas on a metal film can transmit to the surface even minute mechanical disturbances occurring in the depth, thus allowing the gentlest of all surface probes, helium atoms, to perceive the vibrations of the deepest atoms via the induced surface-charge density oscillations. A density functional perturbation theory (DFPT) and a helium atom scattering study of the phonon dispersion curves in lead films of up to 7 mono-layers on a copper substrate show that: (a) the electron-phonon interaction is responsible for the coupling of He atoms to in-depth phonon modes; and (b) the inelastic HAS intensity from a given phonon mode is proportional to its electron-phonon coupling. The direct determination of mode-selected electron-phonon coupling strengths has great relevance for understanding superconductivity in thin films and two-dimensional systems.

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Language(s): eng - English
 Dates: 2014-01-06
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 711941
DOI: 10.1039/c3cp54834a
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Title: Physical Chemistry Chemical Physics
Source Genre: Journal
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Affiliations:
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Pages: - Volume / Issue: 16 (16) Sequence Number: 10.1039/C3CP54834A Start / End Page: 7159 - 7172 Identifier: -