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Surface acoustic waves and elastic constants of InN epilayers determined by Brillouin scattering



The surface acoustic wave velocity in InN has been experimentally determined by means of Brillouin scattering experiments on c - and m -face epilayers. From simulations based on the Green's function formalism we determine the shear elastic constants c66 and c44 and propose a complete set of elastic constants for wurtzite InN. The analysis of the sagittal and azimuthal dependence of the surface acoustic wave velocity indicates a slightly different elastic behavior of the m -face sample that basically affects the c44 elastic constant. (© 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)