Surface phonons on Pb(111) |
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Authors: | Sklyadneva I Yu Heid R Bohnen K-P Echenique P M Chulkov E V |
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Affiliation: | Donostia International Physics Center, 20018 San Sebastián/Donostia, Basque Country, Spain. |
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Abstract: | We present an ab initio study of the lattice dynamics of the Pb(111) surface. The calculations were carried out within the density-functional theory using a linear response approach in the mixed-basis pseudopotential representation. We observe a rich spectrum of surface localized modes, and make a detailed assignment to measured modes in a recent helium-atom scattering experiment. We find that the inclusion of spin–orbit coupling considerably softens the phonon spectrum of the surface, thereby improving the agreement with experiment significantly. |
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