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Chin. Phys. B, 2012, Vol. 21(9): 097801    DOI: 10.1088/1674-1056/21/9/097801
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Finite size effect on Raman frequency of phonons in nano-semiconductors

Xia Lei (夏磊)a, Zhong Kai (钟凯)a, Song Yang (宋阳)a, Lu Xin (陆欣)a, Xu Lü-Shun (许旅顺)a, Yan Yan (阎研)a, Li Hong-Dong (李红东)a, Yuan Fang-Li (袁方利)b, Jiang Jian-Zhong (蒋建中)c, Yu Da-Peng (俞大鹏)a, Zhang Shu-Lin (张树霖)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
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 be originated from the long-range Fröhlich 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.
Keywords:  Raman spectral      finite size effect      nano-semiconductor  
Received:  31 March 2012      Revised:  15 May 2012      Accepted manuscript online: 
PACS:  78.30.Am (Elemental semiconductors and insulators)  
Fund: Project supported by the National Basic Research Program of China (Grants Nos. 2009CB929403 and 2012CB825700) and the National Natural Science Foundation of China (Grants Nos. 10774006 and 60876002).
Corresponding Authors:  Zhang Shu-Lin     E-mail:  slzhang@pku.edu.cn

Cite this article: 

Xia Lei (夏磊), Zhong Kai (钟凯), Song Yang (宋阳), Lu Xin (陆欣), Xu Lü-Shun (许旅顺), Yan Yan (阎研), Li Hong-Dong (李红东), Yuan Fang-Li (袁方利), Jiang Jian-Zhong (蒋建中), Yu Da-Peng (俞大鹏), Zhang Shu-Lin (张树霖) Finite size effect on Raman frequency of phonons in nano-semiconductors 2012 Chin. Phys. B 21 097801

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