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Resonant Raman spectroscopy of twisted multilayer graphene.

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Wu, Jiang-Bin 
Zhang, Xin 
Ijäs, Mari 
Han, Wen-Peng 
Qiao, Xiao-Fen 

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.

Description

Keywords

cond-mat.mtrl-sci, cond-mat.mtrl-sci, cond-mat.mes-hall

Journal Title

Nat Commun

Conference Name

Journal ISSN

2041-1723
2041-1723

Volume Title

5

Publisher

Springer Science and Business Media LLC
Sponsorship
Engineering and Physical Sciences Research Council (EP/K017144/1)
Engineering and Physical Sciences Research Council (EP/K01711X/1)
European Commission (604391)
Engineering and Physical Sciences Research Council (EP/L016087/1)