Dispersion of optical and acoustic phonons in diamond and germanium crystals

被引：0
|
作者：
V. S. Gorelik
N. S. Vasil’ev
机构：
[1] Russian Academy of Sciences,Lebedev Institute of Physics
[2] Bauman State Technical University,undefined
来源：
Inorganic Materials | 2012年 / 48卷
关键词：
Brillouin Zone; Optical Phonon; Acoustic Phonon; Continuum Approximation; Slow Neutron;
D O I：
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中图分类号：
学科分类号：
摘要：
The dispersion laws of the optical and acoustic branches in diamond-like crystals have been derived using idealized models of crystal lattices. Two types of analytical expressions have been proposed, whose parameters can be derived from inelastic neutron scattering experiments and the properties of acoustic waves. The calculation results are in satisfactory agreement with experimental data for the crystallographic directions [100], [110], and [111]. The group velocities of optical and acoustic phonons have been determined, and expressions for the effective mass of optical phonons have been derived.
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页码：462 / 468
页数：6
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