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Título

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

Autor Benedek, G.; Bernasconi, M.; Bohnen, K. -P.; Campi, D.; Chulkov, Eugene V. ; Echenique, Pedro M. ; Heid, R.; Sklyadneva, I. Yu.; Toennies, J. P.
Fecha de publicación 2014
EditorRoyal Society of Chemistry (Great Britain)
Citación Physical Chemistry Chemical Physics 16(16): 7159- 7172 (2014)
ResumenThe 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. This journal is © the Partner Organisations 2014.
URI http://hdl.handle.net/10261/102764
DOI10.1039/C3CP54834A
Identificadoresdoi: 10.1039/C3CP54834A
issn: 1463-9076
e-issn: 1463-9084
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