Isotopic disorder-effects on the phonons in germanium

H. D. Fuchs, C. H. Grein, M. Cardona, W. L. Hansen, K. Itoh, E. E. Haller

研究成果: Article査読

26 被引用数 (Scopus)

抄録

High-resolution (±0.02 cm-1) Raman and infrared transmission (ir) measurements were used to study the effect of isotopic disorder on the vibrational properties of Ge crystals. Calculations using the coherent potential and the self-consistent Born approximations were performed and compared with the experiment. The linewidth of the Raman modes is predominantly determined by the anharmonic decay of the optical phonons into lower-energy phonons, with a characteristic decay time of 6.1(±0.1) ps in natural Ge. The phonon energies of the Raman active phonon and the transverse optical ir modes at the Brillouin zone boundary (L,K,W,X-critical point) are shifted by the isotopic disorder in the material. The frequency shifts and the line broadenings are in good agreement with the theoretical calculations.

本文言語English
ページ(範囲)225-228
ページ数4
ジャーナルSolid State Communications
82
4
DOI
出版ステータスPublished - 1992 4月
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 凝縮系物理学
  • 材料化学

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