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Abstract
A Raman scattering experiment was performed on ultrathin-layer superlattices (AlAs${)}_{m}$(GaAs${)}_{n}$ (1,n6). 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.
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