Raman spectroscopy study of twisted tetralayer graphene

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• 作者：Ying Ying Wang ; Jie Jiang ; Chuan Wei Gao ; Hai Yan Nan ; Zhen Hua Ni ; Dong Wang ; Bo Zhong and Guang Wu Wen
• 刊名：Journal of Raman Spectroscopy
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：47
• 期：6
• 页码：668-673
• 全文大小：383K
• ISSN：1097-4555

文摘

We present a systematic Raman study of twisted tetralayer graphene (t(2 + 2)LG), under excitation of two laser lines. In t(2 + 2)LG samples, top Bernal stacked bilayer graphene (2LG stands for Bernal-stacked bilayer graphene) twists different angle relative to bottom 2LG. It is found that 2D and 2D′ peaks of t(2 + 2)LG show positive wavenumber shift relative to those of 2LG. We propose a simplified electronic band structure for t(2 + 2)LG; interlayer interaction-induced changing in electronic band structure can be used to understand the aforementioned spectral features. The electronic structures of t(2 + 2)LG samples are then probed from resonant Raman studies of 2D and 2D′ peaks using two laser lines; electronic dispersions in t(2 + 2)LG samples are given. Our study facilitates understanding of twist angle-dependent electronic properties of tetralayer graphene superlattice. Copyright