Abstract
Phonon spectral densities of the (001) copper surface containing copper adatoms have been calculated at various temperatures using molecular dynamics simulation. The results reveal that the presence of adatoms is manifested mainly by the appearance of new dispersionless peaks which are broadened and shifted to lower energies as the temperature increases. The existent experimental results, as well as lattice dynamics, ab initio calculations and other simulations in the case of a clean surface, are in good agreement with our predictions.
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