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Kim, Kwanpyo
Experimental Nanoscale Physics Lab
Research Interests
  • Two-dimensional (2D) materials, graphene, NEMS, electron microscopy

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Raman Spectroscopy Study of Rotated Double-Layer Graphene: Misorientation-Angle Dependence of Electronic Structure

Cited 104 times inthomson ciCited 85 times inthomson ci
Title
Raman Spectroscopy Study of Rotated Double-Layer Graphene: Misorientation-Angle Dependence of Electronic Structure
Author
Kim, KwanpyoCoh, SinisaTan, Liang Z.Regan, WilliamYuk, Jong MinChatterjee, EricCrommie, M. F.Cohen, Marvin L.Louie, Steven G.Zettl, A.
Keywords
Double layers; Electronic band structure; Interlayer interactions; Raman studies; Relative rotation; Rotation angles; Spectral feature; Theoretical study; Van Hove singularities
Issue Date
2012-06
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v.108, no.24, pp.1 - 6
Abstract
We present a systematic Raman study of unconventionally stacked double-layer graphene, and find that the spectrum strongly depends on the relative rotation angle between layers. Rotation-dependent trends in the position, width and intensity of graphene 2D and G peaks are experimentally established and accounted for theoretically. Our theoretical analysis reveals that changes in electronic band structure due to the interlayer interaction, such as rotational-angle dependent Van Hove singularities, are responsible for the observed spectral features. Our combined experimental and theoretical study provides a deeper understanding of the electronic band structure of rotated double-layer graphene, and leads to a practical way to identify and analyze rotation angles of misoriented double-layer graphene.
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DOI
10.1103/PhysRevLett.108.246103
ISSN
0031-9007
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PHY_Journal Papers
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