Infrared resonance Raman of bilayer graphene: signatures of massive fermions and band structure on the 2D peak

Abstract

Few-layer graphene possesses low-energy carriers which behave as massive fermions, exhibiting intriguing properties in both transport and light scattering experiments. Lowering the excitation energy of resonance Raman spectroscopy down to 1.17 eV we target these massive quasiparticles in the split bands close to the K point. The low excitation energy weakens some of the Raman processes which are resonant in the visible, and induces a clearer frequency-separation of the sub-structures of the resonance 2D peak in bi- and trilayer samples. We follow the excitation-energy dependence of the intensity of each sub-structure and, comparing experimental measurements on bilayer graphene with ab initio theoretical calculations, we trace back such modifications on the joint effects of probing the electronic dispersion close to the band splitting and enhancement of electron-phonon matrix elements.

22 pages, 12 figures

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Cited by in corpus (6)

• Theory of infrared double-resonance Raman spectrum in graphene: the role of the zone-boundary electron-phonon enhancement
• Ab-initio Van der Waals electrodynamics: polaritons and electron scattering from plasmons and phonons in BN-capped graphene
• Variational formulation of dynamical electronic response functions in presence of nonlocal exchange interactions
• Raman tensor for two-dimensional massive Dirac fermions
• QR${}^2$-code: An open-source program for double resonance Raman spectra
• Tight-binding and density-functional study of the Raman tensor in two-dimensional massive Dirac fermion systems