Resonant Raman spectroscopy of twisted multilayer graphene

Jiang-Bin Wu, Xin Zhang, Mari Ijäs, Wen-Peng Han, Xiao-Fen Qiao, Xiao-Li Li, Jiang De-Sheng, Andrea C. Ferrari and Ping-Heng Tan ()
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Jiang-Bin Wu: State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences
Xin Zhang: State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences
Mari Ijäs: Cambridge Graphene Centre, University of Cambridge
Wen-Peng Han: State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences
Xiao-Fen Qiao: State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences
Xiao-Li Li: State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences
Jiang De-Sheng: State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences
Andrea C. Ferrari: Cambridge Graphene Centre, University of Cambridge
Ping-Heng Tan: State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Graphene and other two-dimensional 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 orientation have different optical and electronic properties. Probing and understanding the interface coupling is thus of primary importance for fundamental science and applications. Here we study twisted multilayer graphene flakes with multi-wavelength Raman spectroscopy. We find a significant intensity enhancement of the interlayer coupling modes (C peaks) due to resonance with new optically allowed electronic transitions, determined by the relative orientation of the layers. The interlayer coupling results in a Davydov splitting of the C peak in systems consisting of two equivalent graphene multilayers. This allows us to directly quantify the interlayer interaction, which is much smaller compared with Bernal-stacked interfaces. This paves the way to the use of Raman spectroscopy to uncover the interface coupling of two-dimensional hybrids and heterostructures.

Date: 2014
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DOI: 10.1038/ncomms6309

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