Phonon deformation potentials in wurtzite GaN and ZnO determined by uniaxial pressure dependent Raman measurements

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Journal Article
Applied Physics Letters, 2011, 98 (6)
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We report the phonon deformation potentials of wurtzite GaN and ZnO for all zone center optical phonon modes determined by Raman measurements as a function of uniaxial pressure. Despite all the structural and optical similarities between these two material systems, the pressure dependency of their vibrational spectra exhibits fundamental distinctions, which is attributed to their different bond ionicities. In addition, the LO-TO splitting of the A1and E1phonon modes is analyzed which yields insight into the uniaxial pressure dependency of Born's transverse effective charge eT*. © 2011 American Institute of Physics.
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