Raman study of the vibrational modes in ZnGeN2 (0001)

Eric W. Blanton, Mark Hagemann, Keliang He, Jie Shan, Walter R.L. Lambrecht, Kathleen Kash

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Abstract

A Raman spectroscopy study was carried out on ZnGeN2 hexagonal single crystal (0001)-oriented platelets obtained by reaction of gaseous ammonia with a Zn-Ge-Sn liquid alloy at 758 °C. The sample geometry allowed measurement of the A2 and A1 Raman modes. First-principles calculations of the spectra were carried out using an improved pseudopotential. 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 smaller than could be resolved experimentally, 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.

Original languageEnglish (US)
Article number055704
JournalJournal of Applied Physics
Volume121
Issue number5
DOIs
StatePublished - Feb 7 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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