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Interface Coupling in Twisted Multilayer Graphene by Resonant Raman Spectroscopy of Layer Breathing Modes.
Wu, Jiang-Bin; Hu, Zhi-Xin; Zhang, Xin; Han, Wen-Peng; Lu, Yan; Shi, Wei; Qiao, Xiao-Fen; Ijiäs, Mari; Milana, Silvia; Ji, Wei; Ferrari, Andrea C; Tan, Ping-Heng.
Afiliación
  • Wu JB; †State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
  • Hu ZX; ‡Department of Physics, Renmin University of China, Beijing 100872, China.
  • Zhang X; †State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
  • Han WP; †State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
  • Lu Y; †State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
  • Shi W; †State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
  • Qiao XF; †State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
  • Ijiäs M; §Cambridge Graphene Centre, University of Cambridge, Cambridge CB3 0FA, U.K.
  • Milana S; §Cambridge Graphene Centre, University of Cambridge, Cambridge CB3 0FA, U.K.
  • Ji W; ‡Department of Physics, Renmin University of China, Beijing 100872, China.
  • Ferrari AC; §Cambridge Graphene Centre, University of Cambridge, Cambridge CB3 0FA, U.K.
  • Tan PH; †State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
ACS Nano ; 9(7): 7440-9, 2015 Jul 28.
Article en En | MEDLINE | ID: mdl-26062640
Raman spectroscopy is the prime nondestructive characterization tool for graphene and related layered materials. The shear (C) and layer breathing modes (LBMs) are due to relative motions of the planes, either perpendicular or parallel to their normal. This allows one to directly probe the interlayer interactions in multilayer samples. Graphene and other two-dimensional (2d) crystals can be combined to form various hybrids and heterostructures, creating materials on demand with properties determined by the interlayer interaction. This is the case even for a single material, where multilayer stacks with different relative orientations have different optical and electronic properties. In twisted multilayer graphene there is a significant enhancement of the C modes due to resonance with new optically allowed electronic transitions, determined by the relative orientation of the layers. Here we show that this applies also to the LBMs, which can be now directly measured at room temperature. We find that twisting has a small effect on LBMs, quite different from the case of the C modes. This implies that the periodicity mismatch between two twisted layers mostly affects shear interactions. Our work shows that ultralow-frequency Raman spectroscopy is an ideal tool to uncover the interface coupling of 2d hybrids and heterostructures.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: ACS Nano Año: 2015 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: ACS Nano Año: 2015 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos