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Raman study of the vibrational modes in ZnGeN2 (0001) | Eric W. Blanton
; Mark Hagemann
; Keliang He
; Jie Shan
; Walter R. L. Lambrecht
; Kathleen Kash
; | Date: |
29 Sep 2016 | Abstract: | A Raman spectroscopy study was carried out for ZnGeN2 with direction of
propagation along the (0001) crystallographic direction on hexagonal single
crystal platelets obtained by reaction of gaseous ammonia with a Zn-Ge-Sn
liquid alloy at 758 degree C. The sample geometry allowed measurement of the a2
and a1 Raman modes. First-principles calculations were carried out of the
spectra. Measurements with crossed polarizers yielded spectra that agreed well
with first-principles calculations of the a2 modes. Measurements with parallel
polarizers should in principle provide the a1L modes. However, for most of the
Raman modes, the LO-TO splitting was calculated to be very small, and for the
few modes which were predicted to have larger LO-TO splittings, the LO mode was
not observed. This absence is tentatively explained in terms of overdamped
LO-plasmon coupling. LO-TO mode crossing was identified by comparing the
calculated eigenvectors and intensities of individual modes. Some features in
the experimental spectra were identified as arising from critical points in the
phonon density of states and are indicative of the degree of disorder on the
cation lattice. | Source: | arXiv, 1609.9535 | Services: | Forum | Review | PDF | Favorites |
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