Abstract
We studied Raman spectra of (AlAs) n /(GaP) n and (AlAs) n /(AlP) n ( n = 1 – 5 ) strained short-period superlattices (SLs) grown by gas-source migration-enhanced epitaxy on (0 0 1) GaAs substrates. We found that GaP- and AlAs-like longitudinal optical (LO) phonons in the (AlAs) n /(GaP) n SLs and AlP-like LO phonons in the (AlAs) n /(AlP) n SLs were confined in respective layers. We discuss the dependence of observed LO phonon frequency on superlattice period using the linear chain model.
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