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Resonant Phonons in Adsorbed Slabs

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Dobrzynski L., Akjouj A., Syla B., Djafari-Rouhani B.

Acta Physica Polonica A

1992

vol. 81

issue 1

85-90

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.

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1 Acta Physica Polonica A

1 1992

1 Akjouj A.

1 Djafari-Rouhani B.

1 Dobrzynski L.

1 Syla B.

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Resonant Phonons in Adsorbed Slabs