title: Phonon lineshapes in atom-surface scattering.
abstract: Phonon lineshapes in atom-surface scattering are obtained from a simple stochastic model based on the so-called Caldeira-Leggett Hamiltonian. In this single-bath model, the excited phonon resulting from a creation or annihilation event is coupled to a thermal bath consisting of an infinite number of harmonic oscillators, namely the bath phonons. The diagonalization of the corresponding Hamiltonian leads to a renormalization of the phonon frequencies in terms of the phonon friction or damping coefficient. Moreover, when there are adsorbates on the surface, this single-bath model can be extended to a two-bath model accounting for the effect induced by the adsorbates on the phonon lineshapes as well as their corresponding lineshapes.
authors.affiliation: Department of Chemistry, Imperial College London, South Kensington, London, UK.
authors.forename: R
authors.initials: R
authors.lastname: Martínez-Casado
authors.forename: A S
authors.initials: AS
authors.lastname: Sanz
authors.forename: S
authors.initials: S
authors.lastname: Miret-Artés