Twist angle dependent absorption feature induced by interlayer rotations in CVD bilayer graphene
Zhou Wen-Guang,
Leng Yu-Chen,
Liu Li-Xiang,
Yang Ming-Ming,
Liu Wei,
Liu Jing-Lan,
Zhao Pei,
Liu Yi,
Wang Long-Long,
Shang Ya-Xuan,
Li Xiao-Li,
Zhao Xiao-Hui,
Liu Xue-Lu,
Xu Yang
Affiliations
Zhou Wen-Guang
National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices & Hebei Key laboratory of Optic-electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding071002, China
Leng Yu-Chen
State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing100083, China
Liu Li-Xiang
Colleges of ISEE and Microelectronics, State Key Laboratories of Modern Optical Instrumentation and Silicon Materials, Hangzhou Global Scientific and Technological Innovation Center, ZJU-UIUC Joint Institute, Zhejiang University, Hangzhou310027, China
Yang Ming-Ming
National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices & Hebei Key laboratory of Optic-electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding071002, China
Liu Wei
Colleges of ISEE and Microelectronics, State Key Laboratories of Modern Optical Instrumentation and Silicon Materials, Hangzhou Global Scientific and Technological Innovation Center, ZJU-UIUC Joint Institute, Zhejiang University, Hangzhou310027, China
Liu Jing-Lan
Center for X-Mechanics and Institute of Applied Mechanics, Zhejiang University, Hangzhou310027, China
Zhao Pei
Center for X-Mechanics and Institute of Applied Mechanics, Zhejiang University, Hangzhou310027, China
Liu Yi
National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices & Hebei Key laboratory of Optic-electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding071002, China
Wang Long-Long
National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices & Hebei Key laboratory of Optic-electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding071002, China
Shang Ya-Xuan
State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing100083, China
Li Xiao-Li
National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices & Hebei Key laboratory of Optic-electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding071002, China
Zhao Xiao-Hui
National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices & Hebei Key laboratory of Optic-electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding071002, China
Liu Xue-Lu
State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing100083, China
Xu Yang
Colleges of ISEE and Microelectronics, State Key Laboratories of Modern Optical Instrumentation and Silicon Materials, Hangzhou Global Scientific and Technological Innovation Center, ZJU-UIUC Joint Institute, Zhejiang University, Hangzhou310027, China
Bilayer graphene (BLG) grown via chemical vapor deposition (CVD) tends to exhibit twisted stacking. The twist angle θ t in twisted BLG (tBLG) provides a new degree of freedom for engineering its electronic and optical properties. In this paper, we investigate the θ t-dependent optical absorption in tBLG and deeply understand the electronic structure-optical properties correlations. New absorption peaks, whose wavelengths are modified by θ t, are observed on the feature of optical contrast (OC) in tBLG. Under the corresponding energy excitation, the Raman G mode in tBLG exhibits a significant enhancement. Furthermore, the results of θ t obtained by OC absorption peak are verified to be consistent with those by the Raman R mode. All these properties are proved to be related to the energy difference between low-energy Van Hove singularities (E VHS) in the density of states of tBLGs. This work builds a relation between optical absorption and twist angle, providing a viable method to identifying twist angles in tBLGs.
