The Shear Mode of Multi-Layer Graphene
P. H. Tan, W. P. Han, W. J. Zhao, Z. H. Wu, K. Chang, H. Wang, Y. F., Wang, N. Bonini, N. Marzari, G. Savini, A. Lombardo, A. C. Ferrari
TL;DR
This paper identifies and characterizes the interlayer shear mode in multi-layer graphene using Raman spectroscopy, revealing its dependence on layer number and its potential as a probe of interlayer interactions.
Contribution
It reports the observation of the shear mode across various multi-layer graphene samples and links its frequency to interlayer coupling strength, introducing a new spectroscopic probe.
Findings
Shear mode frequency decreases from ~43cm-1 in graphite to ~31cm-1 in bilayer graphene.
The shear mode exhibits a Breit-Wigner-Fano lineshape due to electronic resonance.
The shear mode can serve as a universal probe for interlayer interactions in layered materials.
Abstract
We uncover the interlayer shear mode of multi-layer graphene samples, ranging from bilayer-graphene (BLG) to bulk graphite, and show that the corresponding Raman peak measures the interlayer coupling. This peak scales from~43cm-1 in bulk graphite to~31cm-1 in BLG. Its low energy makes it a probe of near-Dirac point quasi-particles, with a Breit-Wigner-Fano lineshape due to resonance with electronic transitions. Similar shear modes are expected in all layered materials, providing a direct probe of interlayer interactions
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