Abbreviated Journal Title
Phys. Rev. B
CARBON NANOTUBES; GRAPHITE; SPECTRUM; SINGLE; Physics, Condensed Matter
We report on multiphonon Raman scattering in graphene samples. Higher-order combination modes involving three and four phonons are observed in single-layer, bilayer, and few-layer graphene samples prepared by mechanical exfoliation. The intensity of the higher-order phonon modes (relative to the G peak) is highest in single-layer graphene and decreases with increasing layers. In addition, all higher-order modes are observed to upshift in frequency almost linearly with increasing graphene layers, betraying the underlying interlayer van der Waals interactions.
Physical Review B
Rao, Rahul; Tishler, Derek; Katoch, Jyoti; and Ishigami, Masa, "Multiphonon Raman scattering in graphene" (2011). Faculty Bibliography 2010s. 1800.