Observation of the Kohn anomaly near the K point of bilayer graphene

Abstract

The dispersion of electrons and phonons near the K point of bilayer graphene was investigated in a resonant Raman study using different laser excitation energies in the near infrared and visible range. The electronic structure was analyzed within the tight-binding approximation, and the Slonczewski-Weiss-McClure (SWM) parameters were obtained from the analysis of the dispersive behavior of the Raman features. A softening of the phonon branches was observed near the K point, and results evidence the Kohn anomaly and the importance of considering electron-phonon and electron-electron interactions to correctly describe the phonon dispersion in graphene systems.

4 pages, 4 figures

References in corpus (15)

• The electronic properties of graphene
• The Raman Fingerprint of Graphene
• Electrochemically Top Gated Graphene: Monitoring Dopants by Raman Scattering
• Electric Field Effect Tuning of Electron-Phonon Coupling in Graphene
• Ab Initio Theory of Gate Induced Gaps in Graphene Bilayers
• Probing the Electronic Structure of Bilayer Graphene by Raman Scattering
• Determination of the electronic structure of bilayer graphene from infrared spectroscopy results
• Impact of the electron-electron correlation on phonon dispersions: failure of LDA and GGA functionals in graphene and graphite
• Tight--binding description of the quasiparticle dispersion of graphite and few--layer graphene
• Infrared spectroscopy of electronic bands in bilayer graphene
• Observation of Anomalous Phonon Softening in Bilayer Graphene
• Observation of Distinct Electron-Phonon Couplings in Gated Bilayer Graphene
• Phonon surface mapping of graphite: disentangling quasi--degenerate phonon dispersions
• A consistent interpretation of the low temperature magneto-transport in graphite using the Slonczewski--Weiss--McClure 3D band structure calculations
• Band structure asymmetry of bilayer graphene revealed by infrared spectroscopy

Cited by in corpus (15)

• Electronic properties of graphene-based bilayer systems
• Long ranged interactions in carbon atomic chains
• Determination of Edge Purity in Bilayer Graphene Using micro-Raman Spectroscopy
• Topological Singularity Induced Chiral Kohn Anomaly in a Weyl Semimetal
• Two-dimensional analysis of the double-resonant 2D Raman mode in bilayer graphene
• Emergence of a ZO Kohn anomaly in quasi-freestanding epitaxial graphene
• Spectral features due to inter-Landau-level transitions in the Raman spectrum of bilayer graphene
• On the inner Double-Resonance Raman scattering process in bilayer graphene
• Probing enhanced electron-phonon coupling in graphene by infrared resonance Raman spectroscopy
• Role of electronic excitations in magneto-Raman spectra of graphene
• Raman spectra of twisted bilayer graphene close to the magic angle
• Electron-phonon coupling in a magic-angle twisted-bilayer graphene device
• Infrared phonon activity in pristine graphite
• Raman signature of electron-electron correlation in chemically doped few-layer graphene
• Thermal smearing of the magneto-Kohn anomaly for Dirac materials and comparison with the two-dimensional electron liquid