Publications Details

Publications / Journal Article

Resonance Raman spectroscopy of G-line and folded phonons in twisted bilayer graphene with large rotation angles

Wang, Yanan; Su, Zhihua; Wu, Wei; Nie, Shu; Xie, Nan; Gong, Huiqi; Guo, Yang; Hwan Lee, Joon; Xing, Sirui; Lu, Xiaoxiang; Wang, Haiyan; Lu, Xinghua; McCarty, Kevin; Pei, Shin S.; Robles-Hernandez, Francisco; Hadjiev, Viktor G.; Bao, Jiming

We report the synthesis and systematic Raman study of twisted bilayer graphene (tBLG) with rotation angles from below 10° to nearly 30°. Chemical vapor deposition was used to grow hexagon-shaped tBLG with a rotation angle that can be conveniently determined by relative edge misalignment. Rotation dependent G-line resonances and folded phonons were observed by selecting suitable energies of excitation lasers. The observed phonon frequencies of the tBLG superlattices agree well with our ab initio calculation. © 2013 AIP Publishing LLC.