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          Institute: MPI für Dynamik und Selbstorganisation     Collection: Max-Planck-Fellow Zippelius     Display Documents

ID: 711941.0, MPI für Dynamik und Selbstorganisation / Max-Planck-Fellow Zippelius
Unveiling mode-selected electron-phonon interactions in metal films by helium atom scattering
Authors:Benedek, G.; Bernasconi, M.; Bohnen, K. P.; Campi, D.; Chulkov, E. V.; Echenique, P. M.; Heid, R.; Sklyandneva, I. Y.; Toennies, J. P.
Date of Publication (YYYY-MM-DD):2014-01-06
Title of Journal:Physical Chemistry Chemical Physics
Issue / Number:16
Start Page:7159
End Page:7172
Sequence Number of Article:10.1039/C3CP54834A
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:Folkert Mueller-Hoissen
Affiliations:MPI für Dynamik und Selbstorganisation/Molekulare Wechselwirkung
External Affiliations:DIPC, Donostia San Sebastian 20018, Spain
Univ Milano Bicocca, Dipartimento Sci Mat, I-20125 Milan, Italy
Karlsruher Inst Technol, Inst Festkorperphys, D-76021 Karlsruhe, Germany
Univ Basque Country, Euskal Herriko Unibertsitatea, Dept Fis Mat, E-20018 Donostia San Sebastian, Spain
Univ Basque Country, Euskal Herriko Unibertsitatea, CFM CSIC UPV EHU, E-20018 Donostia San Sebastian, Spain
Tomsk State Univ, Tomsk 634050, Russia
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