Modulation of Anisotropy on Phonon Transportation in MgS: Theoretical Studies
Modulation of Anisotropy on Phonon Transportation in MgS: Theoretical Studies
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DOI：
10.5539/jmsr.v4n2p1
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发表时间：
2014-12
期刊：
影响因子：
--
通讯作者：
L. Yao;H. Fu;J. Fu
中科院分区：
文献类型：
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作者：
L. Yao;H. Fu;J. Fu
用连续弹性介质理论和物理声学理论研究了固态MGS的各向异性和声子聚焦。从理论上研究了三维图形及其投影中的各向异性和声子传播。三维慢度面的轮廓线提供了纵模和横模的混合情况，并揭示了由于弹性各向异性晶体中声子相速度和群速度通常不共线而产生声子焦散的原因。各向异性与慢度的对比研究表明，弹性波的传播受晶格弹性各向异性的影响，声子焦散沿弹性各向异性的极端方向“行走”。
The anisotropy and phonon focusing of MgS are investigated through continuously elastic medium theory and physical acoustics theory in the solid state. The anisotropy and phonon propagation are theoretically researched in three–dimensional figures and their projections. The contours of three dimensional slowness surfaces give insights into the mixing of longitudinal modes and transverse modes, and show the origin of the phonon caustics due to the fact that the phonon phase velocity and group velocity are generally not collinear in elastically anisotropic crystals. The comparative investigations between anisotropy and slowness show that the propagation of elastic wave is affected by the elastic anisotropy of the lattice, and the phonon caustics “walk along” the extreme direction of elastic anisotropy.