Observation of Distinct Electron-Phonon Couplings in Gated Bilayer Graphene

Abstract

A Raman study of a back gated bilayer graphene sample is presented. The changes in the Fermi level induced by charge transfer splits the Raman G-band, hardening its higher component and softening the lower one. These two components are associated with the symmetric (S) and anti-symmetric vibration (AS) of the atoms in the two layers, the later one becoming Raman active due to inversion symmetry breaking. The phonon hardening and softening are explained by considering the selective coupling of the S and AS phonons with interband and intraband electron-hole pairs.

arXiv comment4 pages, 4 figures

References in corpus (14)

• The Raman Fingerprint of Graphene
• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• Electrochemically Top Gated Graphene: Monitoring Dopants by Raman Scattering
• Spatially Resolved Raman Spectroscopy of Single- and Few-Layer Graphene
• Biased bilayer graphene: semiconductor with a gap tunable by electric field effect
• Gate-induced insulating state in bilayer graphene devices
• Raman scattering from high frequency phonons in supported n-graphene layer films
• Born-Oppenheimer Breakdown in Graphene
• Electric Field Effect Tuning of Electron-Phonon Coupling in Graphene
• Kohn Anomalies and Electron-Phonon Interaction in Graphite
• Non-adiabatic Kohn-anomaly in a doped graphene monolayer
• Probing the Electronic Structure of Bilayer Graphene by Raman Scattering
• Electron-Phonon Coupling and Raman Spectroscopy in Graphene
• Observation of Anomalous Phonon Softening in Bilayer Graphene

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