Structurally Dependent Fano Resonances in the Infrared Spectra of Phonons in Few-Layer Graphene

Abstract

The in-plane optical phonons around 200 meV in few-layer graphene are investigated utilizing infrared absorption spectroscopy. The phonon spectra exhibit unusual asymmetric features characteristic of Fano resonances, which depend critically on the layer thickness and stacking order of the sample. The phonon intensities in samples with rhombohedral (ABC) stacking are significantly higher than those with Bernal (AB) stacking. These observations reflect the strong coupling between phonons and interband electronic transitions in these systems and the distinctive variation in the joint density of electronic states in samples of differing thickness and stacking order.

20 pages, 7 figures, supplementary material included

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• Strong coupling in the far-infrared between graphene plasmons and the surface optical phonons of silicon dioxide
• Nature and Raman signatures of the Higgs amplitude mode in the coexisting superconducting and charge-density-wave state
• Temperature-activated layer-breathing vibrations in few-layer graphene
• Stacking-dependent shear modes in trilayer graphene
• Fano resonance in Raman scattering of graphene
• Optical excitation of phase modes in strongly disordered superconductors
• Charged-phonon theory and Fano effect in the optical spectroscopy of bilayer graphene
• Temperature evolution of infrared- and Raman-active phonons in graphite
• Ferromagnetism in ABC-trilayer graphene
• Direct Probing Stacking Order and Electronic Spectrum of Rhombohedral Trilayer Graphene with Scanning Tunneling Microscopy
• Stacking order, interaction and weak surface magnetism in layered graphene sheets
• Valley filtering effect of phonons in graphene with a grain boundary
• First-principles theory of infrared vibrational spectroscopy in metals and semimetals: application to graphite
• Flat band electrons and interactions in rhombohedral trilayer graphene
• Fano Resonances in Mid-Infrared Spectra of Single-Walled Carbon Nanotubes
• Hopping-resolved electron-phonon coupling in bilayer graphene
• Tunable Infrared Phonon Anomalies in Trilayer Graphene
• Fano Resonances in the Infrared Spectra of Phonons in Hyper-Kagome Na_3Ir_3O_8
• Spectroscopic Signatures of Electronic Excitations in Raman Scattering in Thin Films of Rhombohedral Graphite
• Infrared phonon activity in pristine graphite
• Tunable terahertz plasmons in graphite thin films
• Terahertz Magnetic and Lattice Excitations in van der Waals Ferromagnet VI3
• Fano q-reversal in topological insulator Bi2Se3
• Electronic Structures and Their Landau Quantizations in Twisted Graphene Bilayer and Trilayer
• Stacking sequence determines Raman intensities of observed interlayer shear modes in 2D layered materials - A general bond polarizability model
• Chiral electronic excitations and strong electron-phonon coupling to Weyl fermions in the Kagome semimetal Co${}_3$Sn${}_2$S${}_2$
• Phonon-Induced Transparency in Functionalized Single Layer Graphene