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报道用喇曼散射技术对a-Si:H/a-SiN:H和a-Si:H/a-SiC:H两种周期性超晶格中纵声学声子折叠模的系列研究结果。获得了a-Si:H/a-SiC:H超晶格的纵声学声子折叠谱。并用弹性连续介质模型对折叠纵声学声子的色散关系进行了理论计算,其结果与实验值符合得很好。同时,对布里渊区中心频隙的存在做了简单的讨论。In this paper, we report the systematic results of folded LA phonon modes in the a-Si: H/a-SiN:H and a-Si: H/a-SiC:H periodic superlattices. We use the elastic continuum model to obtain the theoretical results, which are in good agreement with the experimental values. Finally, the problem of the existence of frequency-gap at the center of the Brillouin zone is briefly discussed.
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