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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Phonon Properties of Few-Layer Crystals of Quasi-One-Dimensional ZrS3 and ZrSe3
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Phonon Properties of Few-Layer Crystals of Quasi-One-Dimensional ZrS3 and ZrSe3

机译:准一维ZrS3和ZrSe3的几层晶体的声子性质

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The frequencies of Raman active modes of few-layer ZrS3 and ZrSe3 and their dependence on the number of layers have been investigated by Raman scattering spectroscopy and first-principles calculations. We find a considerable downshift of the frequency of the A(g)(3) mode with decreasing the number of layers, and a slight downshift of the A(g)(5) mode. The same frequency shifts are reproduced by the calculations with remarkable accuracy. We explain the difference in the frequency shifts of the A(g)(3) and A(g)(5) modes in terms of intrachain, interchain, and interlayer force constants in simple one-dimensional lattice models. We thus show that the large shift of the A(g)(3) mode reflects the quasi-one-dimensional structure of ZrS3 and ZrSe3, which does not exist in the more widely studied two-dimensional materials.
机译:几层ZrS3和ZrSe3的拉曼活性模式的频率及其对层数的依赖性已通过拉曼散射光谱法和第一性原理计算进行了研究。我们发现,随着层数的减少,A(g)(3)模式的频率有明显的下移,而A(g)(5)模式的频率有轻微的下移。通过计算可以精确地再现相同的频移。我们用简单的一维晶格模型解释了链内,链间和层间力常数方面的A(g)(3)和A(g)(5)模式的频移差异。因此,我们表明,A(g)(3)模式的大位移反映了ZrS3和ZrSe3的准一维结构,而在更广泛研究的二维材料中不存在这种结构。

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