We show that the phonon spectra of finite GaAs/AIAs(001) superlattices along their growth direction display a new type of confined surface modes which split off the superlattice confined optical branches. Their frequency location and decay inside the superlattice is investigated by means of a model calculation and compared with the behaviour of surface states of semi-infinite GaAs.
Surface confined phonons in semiconductor superlattices / Sorba, Lucia; Molinari, Elisa; Fasolino, Annalisa. - In: SURFACE SCIENCE. - ISSN 0039-6028. - STAMPA. - 211-212:(1989), pp. 354-360. [10.1016/0039-6028(89)90790-5]
Surface confined phonons in semiconductor superlattices
SORBA, Lucia;MOLINARI, Elisa;FASOLINO, Annalisa
1989
Abstract
We show that the phonon spectra of finite GaAs/AIAs(001) superlattices along their growth direction display a new type of confined surface modes which split off the superlattice confined optical branches. Their frequency location and decay inside the superlattice is investigated by means of a model calculation and compared with the behaviour of surface states of semi-infinite GaAs.
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