Anisotropic polarization due to electron-phonon interactions in graphene

被引：0
作者：
Li Wuqun [1 ]
Cao Juncheng [1 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China
来源：
JOURNAL OF SEMICONDUCTORS | 2009年 / 30卷 / 11期
基金：
中国国家自然科学基金;
关键词：
graphene; electron-phonon interaction; anisotropy; polarization;
D O I：
10.1088/1674-4926/30/11/112002
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Polarization plays an important role in the Raman spectroscopy. We study, in graphene, anisotropic polarization due to electronphonon coupling (EPC). The numerical results show that the anisotropy is obvious even when the wave vector is in the range of the Raman experiment. The analytical expression is deduced from the structure factor, which indicates the crucial origin of the anisotropy. We also find that, as the phonon energy increases the polarization is clearly weakened due to the screen effect of EPC, but the anisotropy totally remains.
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页数：4
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