J. Semicond. > Volume 30 > Issue 11 > Article Number: 112002

Anisotropic polarization due to electron–phonon interactions in graphene

Li Wuqun and Cao Juncheng

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Abstract: Polarization plays an important role in the Raman spectroscopy. We study, in graphene, anisotropic polarization due to electron–phonon 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.

Key words: graphene

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Li W Q, Cao J C. Anisotropic polarization due to electron–phonon interactions in graphene[J]. J. Semicond., 2009, 30(11): 112002. doi: 10.1088/1674-4926/30/11/112002.

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Manuscript received: 18 August 2015 Manuscript revised: 05 June 2009 Online: Published: 01 November 2009

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