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Polar optical-phonon modes are derived analytically for spheroidal quantumdots with wurtzite crystal structure. The developed theory is applied to afreestanding spheroidal ZnO quantum dot and to a spheroidal ZnO quantum dotembedded into a MgZnO crystal. The wurtzite (anisotropic) quantum dots areshown to have strongly different polar optical-phonon modes in comparison withzincblende (isotropic) quantum dots. The obtained results allow one to explainand accurately predict phonon peaks in the Raman spectra of wurtzitenanocrystals, nanorods (prolate spheroids), and epitaxial quantum dots (oblatespheroids).Comment: 11 page

Polar optical phonons in wurtzite spheroidal quantum dots: theory and application to ZnO and ZnO/MgZnO nanostructures