Resonant Phonons in Adsorbed Slabs |
| L. Dobrzynski, A. Akjouj, B. Syla and B. Djafari-Rouhani Equipe Internationale de Dynamique des Interfaces, Laboratoire de Dynamique et Structure des Matériaux Moléculaires, U.R.A. au C.N.R.S. n° 801, U.F.R. de Physique, Université de Lille I, 59655 Villeneuve d'Ascq Cedex, France |
| Received: May 21, 1991 |
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| Resonant phonons, sometimes also called leaky waves, are phonons associated with a crystal defect, a surface, an adsorbed layer and whose frequencies fall inside the bulk crystal band. Such resonant phonons were studied experimentally and theoretically before for clean surfaces and for adsorbed monolayers. We present here a study of resonant phonons associated with the adsorption of a slab of L monolayers on a substrate. With the help of a simple atomic model, we obtained a closed form expression giving the variation of the transverse phonon density of states associated with the adsorption of the slab. An application which qualitatively simulates the adsorption of L monolayers of Ge on Si shows the existence of well-defined resonant phonons within the bulk acoustic band of the substrate. |
| DOI: 10.12693/APhysPolA.81.85 PACS numbers: 68.60.-p |