The shear mode of multilayer graphene

Authors
Tan, PH 
Han, WP 
Zhao, WJ 
Wu, ZH 
Chang, K 

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Type
Article
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Abstract

The quest for materials capable of realizing the next generation of electronic and photonic devices continues to fuel research on the electronic, optical and vibrational properties of graphene. Few-layer graphene (FLG) flakes with less than ten layers each show a distinctive band structure. Thus, there is an increasing interest in the physics and applications of FLGs. Raman spectroscopy is one of the most useful and versatile tools to probe graphene samples. Here, we uncover the interlayer shear mode of FLGs, ranging from bilayer graphene (BLG) to bulk graphite, and suggest that the corresponding Raman peak measures the interlayer coupling. This peak scales from ~43 cm−1 in bulk graphite to ~31 cm−1 in BLG. Its low energy makes it sensitive to near-Dirac point quasiparticles. Similar shear modes are expected in all layered materials, providing a direct probe of interlayer interactions.

Publication Date
2012-04
Online Publication Date
2012-02-05
Acceptance Date
2012-01-09
Keywords
cond-mat.mes-hall, cond-mat.mes-hall, cond-mat.mtrl-sci
Journal Title
Nature Materials
Journal ISSN
1476-1122
1476-4660
Volume Title
Publisher
Springer Nature
Sponsorship
Engineering and Physical Sciences Research Council (EP/G042357/1)