Surface lattice dynamics and electron-phonon interaction in cesium ultra-thin 
films

Campi, D.; Bernasconi, M.; Benedek, G.; Graham, A. P.; Toennies, Jan Peter

doi:10.1039/c7cp01572k

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Surface lattice dynamics and electron-phonon interaction in cesium ultra-thin films

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Graham, A. P.
Emeritus Group Molecular Interactions, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Toennies, Jan Peter
Emeritus Group Molecular Interactions, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Campi, D., Bernasconi, M., Benedek, G., Graham, A. P., & Toennies, J. P. (2017). Surface lattice dynamics and electron-phonon interaction in cesium ultra-thin films. Physical Chemistry Chemical Physics, 19(25), 16358-16364. doi:10.1039/c7cp01572k.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-9E7C-8

Abstract

The phonon dispersion curves of ultrathin films of Cs(110) on Pt(111) measured with inelastic helium atom scattering (HAS) are reported and compared with density-functional perturbation theory (DFPT) calculations. The combined HAS and DFPT analysis also sheds light on the bulk phonon dynamics of bcc-Cs, on which very little is known from neutron scattering due to its large neutron capture cross-section. Moreover the temperature dependence of the elastic HAS Debye-Waller exponent of Cs(110)/Cu(111) ultrathin films allows for an estimation of the electron-phonon coupling strength l as a function of the film thickness.