Issue 25, 2017

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

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.

Graphical abstract: Surface lattice dynamics and electron–phonon interaction in cesium ultra-thin films

Article information

Article type
Paper
Submitted
11 Mar 2017
Accepted
05 Jun 2017
First published
14 Jun 2017

Phys. Chem. Chem. Phys., 2017,19, 16358-16364

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

D. Campi, M. Bernasconi, G. Benedek, A. P. Graham and J. P. Toennies, Phys. Chem. Chem. Phys., 2017, 19, 16358 DOI: 10.1039/C7CP01572K

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