Defectlike nature of the interface in AB / CD -type superlattices

Based on the calculation of lattice dynamic properties and observation of first-order Raman spectra for the Zn-Se localized microscopic interface mode of the (CdSe${)}_{4}$/(ZnTe${)}_{4}$ superlattice, multiphonon (MP) Raman scattering of up to five orders has been observed. The linewidth variation with MP order and temperature as well as the frequency and intensity behavior with MP order can be interpreted by the anharmonic decay of the localized mode into extended band modes. These results show the defectlike nature of interfaces in AB/CD-type superlattices.