Reduction of Fermi velocity in folded graphene observed by resonance Raman spectroscopy
By Zhenhua Ni, Yingying Wang, T. Yu, Y. You, Zexiang Shen. 2008
232 citations recorded by the source corpus.
The $1+1$ layer folded graphene sheets that deviate from $AB$ stacking are successfully fabricated and their electronic structures are investigated by Raman spectroscopy. Significant blueshift of the 2D band of folded graphene compared to that of single layer graphene (SLG) is observed. This is attributed to SLG-like electronic structure of folded graphene but with slowing down of Fermi velocity (as much as $\ensuremath{\sim}5.6%$). Different amount of blueshift of 2D band is observed for different folded graphenes, which may correspond to the different twist angle and/or separation between the two layers, resulting in different Fermi velocity of folded graphenes. Electronic structure of $1+1$-folded graphene samples with different stacking order (twist and separation between the two layers, and in-plane shift of the two layers) can be investigated by Raman spectroscopy.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/7f2493c4cd675687f773d29dd878c87ec3b69c55
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In Atomic and Molecular Physics, and Optics
In Materials Chemistry
Citations in the corpus
- Electronic properties of graphene-based bilayer systems (2015, background): “These results are in contradiction with those obtained by Landau level [351] and Raman [360] spectroscopies (see the previous paragraph).”
- Raman spectroscopy and imaging of graphene (2008, methodology): “With simple mathematics, the relation of Fermi velocity change and 2D frequency shift can be achieved as: [70]”