Raman selection rules in C<SUP>4</SUP><SUB>6v</SUB> hexagonal crystals: allowed combinations and overtones of vibrational modes in wurtzite GaN by H. W. Kunert

Crystal Research and Technology

Cryst. Res. Technol. 38, 366 (2003) - Abstract -

Raman selection rules in C⁴_6v hexagonal crystals: allowed combinations and overtones of vibrational modes in wurtzite GaN

H. W. Kunert

Department of Physics, University of Pretoria, Pretoria, 0002, South Africa

Keywords Brillouin zones, GaN, phonons, Raman selection rules

A discrete set of oscillators belongs to the critical points in the lattice vibration spectrum. The vibrational states of crystals are classified according to appropriate irreducible representations of the relevant wave vector space groups. Suitable space-group selection rules are used to determine the active one and two phonon combinations and overtone processes in hexagonal structures. Experimental Raman spectra of the hexagonal C⁴_6v GaN are discussed in terms of the derived selection rules.

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