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arXiv 1111.1643cond-mat.mes-hall
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用C $^{12} and C$ ^{13}$同位素研究石墨烯的声子能带结构

Experimental Phonon Band Structure of Graphene using C$^{12} and C$^{13}$ Isotopes

Simon Bernard, Eric Whiteway, Victor Yu, D. G. Austing, Michael Hilke

摘要:

使用非常均匀的大规模化学气相沉积生长的石墨烯转移到硅上,我们能够识别与石墨烯单层相关的15条不同的拉曼谱线。这是可能的,这要归功于不同的碳同位素和不同的拉曼激光能量的组合,以及在不增加激光功率的情况下广泛的平均化。这使我们能够获得详细的实验声子色散关系的许多点的布里渊区。我们进一步确定了一个D+D'峰对应于一个双声子过程,涉及谷间和谷内声子。

英文摘要:

Using very uniform large scale chemical vapor deposition grown graphene transferred onto silicon, we were able to identify 15 distinct Raman lines associated with graphene monolayers. This was possible thanks to a combination of different carbon isotopes and different Raman laser energies and extensive averaging without increasing the laser power. This allowed us to obtain a detailed experimental phonon dispersion relation for many points in the Brillouin zone. We further identified a D+D' peak corresponding to a double phonon process involving both an inter- and intra-valley phonon.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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