作者
Rui He, Ting-Fung Chung, Conor Delaney, Courtney Keiser, Luis A Jauregui, Paul M Shand, CC Chancey, Yanan Wang, Jiming Bao, Yong P Chen
发表日期
2013/8/14
期刊
Nano letters
卷号
13
期号
8
页码范围
3594-3601
出版商
American Chemical Society
简介
Two new Raman modes below 100 cm–1 are observed in twisted bilayer graphene grown by chemical vapor deposition. The two modes are observed in a small range of twisting angle at which the intensity of the G Raman peak is strongly enhanced, indicating that these low energy modes and the G Raman mode share the same resonance enhancement mechanism, as a function of twisting angle. The ∼94 cm–1 mode (measured with a 532 nm laser excitation) is assigned to the fundamental layer breathing vibration (ZO′ mode) mediated by the twisted bilayer graphene lattice, which lacks long-range translational symmetry. The dependence of this mode’s frequency and line width on the rotational angle can be explained by the double resonance Raman process that is different from the previously identified Raman processes activated by twisted bilayer graphene superlattice. The dependence also reveals the …
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