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Finite size effect on the Raman frequency of phonons in nano-semiconductors

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【作者】夏磊；钟凯；宋阳；陆欣；许旅顺；阎研；李红东；袁方利；蒋建中；俞大鹏；张树霖；

【Author】 Xia Lei a) , Zhong Kai a) , Song Yang a) , Lu Xin a) , Xu Lü-Shun a) , Yan Yan a) , Li Hong-Donga) , Yuan Fang-Li b) , Jiang Jian-Zhong(c) , Yu Da-Peng a) , and Zhang Shu-Lin a)a) School of Physics, Peking University, Beijing 100871, China b) Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China c) International Center for New-Structured Materials (ICNSM), Laboratory of New-Structured Materials, and State Key Laboratory of Silicon Materials & Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

【机构】 School of Physics, Peking University； Institute of Process Engineering, Chinese Academy of Sciences； International Center for New-Structured Materials (ICNSM), Laboratory of New-Structured Materials, and State Key Laboratory of Silicon Materials & Department of Materials Science and Engineering, Zhejiang University；

【摘要】 A comprehensive study on Raman spectroscopy with different excitation wavelengths, sample sizes, and sample shapes for optic phonons (OPs) and acoustic phonons (APs) in polar and non-polar nano-semiconductors has been performed. The study affirms that the finite size effect does not appear in the OPs of polar nano-semiconductors, while it exists in all other types of phonons. The absence of the FSE is confirmed to originate from the long-range Fr¨ohlich interaction and the breaking of translation symmetry. The result indicates that the Raman spectra of OPs cannot be used as a method to characterize the scale and crystalline property of polar nano-semiconductors.更多还原

【Abstract】 A comprehensive study on Raman spectroscopy with different excitation wavelengths, sample sizes, and sample shapes for optic phonons (OPs) and acoustic phonons (APs) in polar and non-polar nano-semiconductors has been performed. The study affirms that the finite size effect does not appear in the OPs of polar nano-semiconductors, while it exists in all other types of phonons. The absence of the FSE is confirmed to originate from the long-range Fr¨ohlich interaction and the breaking of translation symmetry. The result indicates that the Raman spectra of OPs cannot be used as a method to characterize the scale and crystalline property of polar nano-semiconductors.更多还原

【关键词】 Raman spectral； finite size effect； nano-semiconductor；
【Key words】 Raman spectral； finite size effect； nano-semiconductor；

【基金】 Project supported by the National Basic Research Program of China (Grants Nos. 2009CB929403 and 2012CB825700);the National Natural Science Foundation of China (Grants Nos. 10774006 and 60876002)

【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2012年09期

【分类号】O471
【下载频次】53

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