Phonon switching and combined Fano-Rice effect in optical spectra of bilayer graphene

Abstract

Recent infrared measurements of phonon peaks in gated bilayer graphene reveal two striking signatures of electron-phonon interaction: an asymmetric Fano lineshape and a giant variation of the peak intensity as a function of the applied gate voltage. In this Letter we provide a unified theoretical framework which accounts for both these effects and unveils the occurrence of a switching mechanism between the symmetric ($E_g$) and anti-symmetric ($E_u$) phonon mode as dominant channel in the optical response. A complete phase diagram of the optical phonon response is also presented, as a function of both the charge density and the bandgap.

arXiv commentfinal version

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• Novel mid-infrared plasmonic properties of bilayer graphene
• Theory of coherent oscillations detection in THz pump-probe spectroscopy: from phonons to electronic collective modes
• Lattice vibrations of the charge-transfer salt $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$: novel interpretation of the electrodynamic response in a spin-liquid compound
• Charged-phonon theory and Fano effect in the optical spectroscopy of bilayer graphene
• 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
• Room-temperature Tunable Fano Resonance by Chemical Doping in Few-layer Graphene Synthesized by Chemical Vapor Deposition
• Coupling of the A_{1g} As-phonon to magnetism in iron pnictides
• Infrared phonon activity in pristine graphite
• Scaling of the Fano effect of the in-plane Fe-As phonon and the superconducting critical temperature in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Bolometric arrays and infrared sensitivity of VO2 films with varying stoichiometry
• Quantum mechanical picture of the coupling between interlayer electronic excitations and infrared active phonons in bilayer cuprate superconductors
• Pressure sensing using vertically aligned carbon nanotubes on a flexible substrate
• Charged moiré phonons in twisted bilayer graphene
• Growth of Tall Vertical Carbon Nanotube Forests using Al-Fe Catalysts and Transfer to Flexible Substrates
• Phonon-Induced Transparency in Functionalized Single Layer Graphene