Raman scattering from (AlAs)m(GaAs)nultrathin-layer superlattices

Abstract
A Raman scattering experiment was performed on ultrathin-layer superlattices (AlAs)m(GaAs)n (1<m,n<6). It was confirmed that LO phonons are confined in respective layers even in ultrathin-layer superlattices. The dependence of observed LO-phonon frequency on the AlAs- and GaAs-layer thickness is in good agreement with a linear chain model.