A Tunable Phonon-Exciton Fano System in Bilayer Graphene

Abstract

Interference between different possible paths lies at the heart of quantum physics. Such interference between coupled discrete and continuum states of a system can profoundly change its interaction with light as seen in Fano resonance. Here we present a unique many-body Fano system composed of a discrete phonon vibration and continuous electron-hole pair transitions in bilayer graphene. Mediated by the electron-phonon interactions, the excited state is described by new quanta of elementary excitations of hybrid phonon-exciton nature. Infrared absorption of the hybrid states exhibit characteristic Fano lineshapes with parameters renormalized by many-body interactions. Remarkably, the Fano resonance in bilayer graphene is continuously tunable through electrical gating. Further control of the phonon-exciton coupling may be achieved with an optical field exploiting the excited state infrared activity. This tunable phonon-exciton system also offers the intriguing possibility of a 'phonon laser' with stimulated phonon amplification generated by population inversion of band-edge electrons.

21 pages, 3 figures

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• Colloquium: Graphene spectroscopy
• Tunable phonon-induced transparency in bilayer graphene nanoribbons
• Dynamic Screening and Low Energy Collective Modes in Bilayer Graphene
• A Large Effective Phonon Magnetic Moment in a Dirac Semimetal
• Breit-Wigner-Fano lineshapes in Raman spectra of graphene
• Temperature-tunable Fano resonance induced by strong coupling between Weyl fermions and phonons in TaAs
• Structurally Dependent Fano Resonances in the Infrared Spectra of Phonons in Few-Layer Graphene
• Observation of Raman G-band splitting in top-doped few-layer graphene
• Novel mid-infrared plasmonic properties of bilayer graphene
• Neutral-current Hall effects in disordered graphene
• Transport spectroscopy of ultraclean tunable band gaps in bilayer graphene
• Observation of forbidden phonons and dark excitons by resonance Raman scattering in few-layer WS${}_2$
• Fano resonance in Raman scattering of graphene
• Charged-phonon theory and Fano effect in the optical spectroscopy of bilayer graphene
• An Exciton-Polariton Fano Resonance Driven by Second Harmonic Generation
• Control of Fano resonances and slow light using Bose-Einstein condensates in a nanocavity
• Resonance-type thickness dependence of optical second harmonic generation in thin-films of the topological insulator Bi2Se3
• Phonon switching and combined Fano-Rice effect in optical spectra of bilayer graphene
• Thickness tunable quantum interference between surface phonon and Dirac plasmon states in thin-films of the topological insulator Bi2Se3
• Phonon-pump XUV-photoemission-probe in graphene: evidence for non-adiabatic heating of Dirac carriers by lattice deformation
• Plasmon-enhanced electron-phonon coupling in Dirac surface states of the thin-film topological insulator Bi2Se3
• Role of Interlayer Coupling in the Second Harmonic Generation of Bilayer Transition-metal Dichalcogenides
• Fano Resonances in Mid-Infrared Spectra of Single-Walled Carbon Nanotubes
• Hopping-resolved electron-phonon coupling in bilayer graphene
• Spectroscopic investigations of phonons in epitaxial graphene
• Relativistic electron transport through an oscillating barrier: wave packet generation and Fano-type resonances
• 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
• Flat-band optical phonons in twisted bilayer graphene
• System-bath entanglement theorem with Gaussian environments
• Infrared phonon activity in pristine graphite
• Enhanced Many-Electron Effects on Excited States of Gated Bilayer Graphene
• Magnetic Oscillation of Optical Phonon in ABA- and ABC-Stacked Trilayer Graphene
• Doping controlled Fano resonance in bilayer 1T${}^{\prime }$-ReS${}_2$: Raman experiments and first-principles theoretical analysis
• Analytical solution of the disordered Tavis-Cummings model and its Fano resonances
• Fano resonance enabled infrared nano-imaging of local strain in bilayer graphene
• Quick Identification of ABC Trilayer Graphene at Nanoscale Resolution via a Near-field Optical Route
• Optical Phonon Anomaly in Bilayer Graphene with Ultrahigh Carrier Densities
• Controlling periodic Fano resonances of quantum acoustic waves with a giant atom coupled to microwave waveguide
• Photonic Spin Hall Effect using bilayer Graphene in Nano Optomechanical Cavities
• Electric Field Effects on the Optical Vibrations in AB-Stacked Bilayer Graphene
• Anomalous behavior of the $E_u^1$ infrared-active phonon mode in a Bi${}_{2-x}$Sr${}_x$Se${}_3$ crystal
• Phonon-Induced Transparency in Functionalized Single Layer Graphene
• Quenching effect of oscillating potential on anisotropic resonant transmission through a phosphorene electrostatic barrier