Zone-center optical phonons in wurtzite InAlN crystal

Abstract

An experimental study of the optical phonons is presented for InAlN epilayers lattice-matched with GaN by means of Raman scattering, and theoretical simulations are done to investigate the zone-center optical phonons of InAlN alloy by using the modified random element isodisplacement (MREI) model. The calculated findings show that the LO and TO branches of InAlN crystal both exhibit nonlinear properties. A comparison is made between the theoretical results and the experimental data, and it shows that they are both consistent for the A1(LO) phonons of InAlN epilayers.

Keywords

Optical Phonon / Local Electric Field / Calculated Finding / Optical Phonon Frequency / Entrance Slit Width

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This work has been supported by Project of Science and Technology in Guangdong Province (No.2009B011100003) and Cooperative Project of Producing, Leading, and Researching between Guangdong Province and Ministry of Education (No.20090300338).