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 λ as a function of the film thickness
Campi, D., Bernasconi, M., Benedek, G., Graham, A., Toennies, J. (2017). Surface lattice dynamics and electron-phonon interaction in cesium ultra-thin films. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 19(25), 16358-16364 [10.1039/c7cp01572k].
Surface lattice dynamics and electron-phonon interaction in cesium ultra-thin films
Campi, D.;Bernasconi, M.
;Benedek, G.;
2017
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 λ as a function of the film thickness
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