Abstract
Recent studies of the surface dynamics of Al(001) and Cu(111) based on densityfunctional perturbation theory have substantiated the existence of subsurface opticalphonon resonances of all three polarizations, thus confirming early predictionsof the embedded-atom method. The hybridization of the shear-vertical opticalresonance with the longitudinal acoustic phonon branch accounts for the ubiquitousanomalous acoustic resonance as an intrinsic feature of metal surfaces. The DFPTcalculation of the phonon-induced surface charge density oscillations shows that heliumatom scattering spectroscopy (HAS) can indeed probe subsurface resonances.This opens new perspectives to HAS for the measurement of subsurface phonondispersion curves in thin films, as proved by recent HAS studies on Pb and Feultrathin films on copper. After discussing these recent advances, this paper brieflyreviews other important trends of surface dynamics expressed in recent years.
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