Strong Polarization Dependence of Double-Resonant Raman Intensities in Graphene

详细信息    查看全文

• 作者：Duhee Yoon ; Hyerim Moon ; Young-Woo Son ; G. Samsonidze ; Bae Ho Park ; Jin Bae Kim ; YoungPak Lee ; Hyeonsik Cheong
• 刊名：Nano Letters
• 出版年：2008
• 出版时间：December 10, 2008
• 年：2008
• 卷：8
• 期：12
• 页码：4270-4274
• 全文大小：287K
• 年卷期：v.8,no.12(December 10, 2008)
• ISSN：1530-6992

文摘

Spatially resolved and polarized micro-Raman spectroscopy on microcrystalline graphene shows strong polarization dependences of double-resonance Raman intensities. The Raman intensity of the double-resonant 2D band is maximum when the excitation and detection polarizations are parallel and minimum when they are orthogonal, whereas that of the G band is isotropic. A calculation shows that this strong polarization dependence is a direct consequence of inhomogeneous optical absorption and emission mediated by electron−phonon interactions involved in the second-order Stokes−Stokes Raman scattering process.