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arXiv 1606.07409cond-mat.mtrl-sci
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$β\text{-Ga}_2\text{O}_3$的Raman张量元

Raman tensor elements of $β\text{-Ga}_2\text{O}_3$

Christian Kranert, Chris Sturm, Rüdiger Schmidt-Grund, Marius Grundmann

摘要:

从实验和理论两方面研究了单斜晶系$β\text{-Ga}_2\text{O}_3$的拉曼光谱,特别是拉曼散射强度。$β\text{-Ga}_2\text{O}_3$的低对称性导致各个声子模式的拉曼强度对散射几何形状的复杂依赖性,散射几何形状还受到双折射的影响。我们测量的拉曼光谱的偏振方向的依赖于后向散射的$β\text{-Ga}_2\text{O}_3$的三个晶面和建模这些依赖关系使用修改后的拉曼张量形式主义,其中考虑到双折射。所有15个拉曼活性声子模式的光谱位置和拉曼张量元素的13个模式被确定,并从从头计算的结果进行比较。

英文摘要:

The Raman spectrum and particularly the Raman scattering intensities of monoclinic $β\text{-Ga}_2\text{O}_3$ are investigated by experiment and theory. The low symmetry of $β\text{-Ga}_2\text{O}_3$ results in a complex dependence of the Raman intensity for the individual phonon modes on the scattering geometry which is additionally affected by birefringence. We measured the Raman spectra in dependence on the polarization direction for backscattering on three crystallographic planes of $β\text{-Ga}_2\text{O}_3$ and modeled these dependencies using a modified Raman tensor formalism which takes birefringence into account. The spectral position of all 15 Raman-active phonon modes and the Raman tensor elements of 13 modes were determined and are compared to results from ab-initio calculations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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