Tuning many-body interactions in graphene: The effects of doping on excitons and carrier lifetimes

Abstract

The optical properties of graphene are strongly affected by electron-electron (e-e) and electron-hole (e-h) interactions. Here we tune these many-body interactions through varying the density of free charge carriers. Measurements from the infrared to the ultraviolet reveal significant changes in the optical conductivity of graphene for both electron and hole doping. The shift, broadening, and modification in shape of the saddle-point exciton resonance reflect strong screening of the many-body interactions by the carriers, as well as changes in quasi-particle lifetimes. Ab initio calculations by the GW Bethe-Salpeter equation (GW-BSE), which take into account modification of both the repulsive e-e and the attractive e-h interactions, provide excellent agreement with experiment. Understanding the optical properties and high-energy carrier dynamics of graphene over a wide range of doping is crucial for both fundamental graphene physics and for emerging applications of graphene in photonics.

11 pages, 4 figures, plus supplementary materials

References in corpus (19)

• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• Measurement of the Optical Conductivity of Graphene
• Universal dynamical conductance in graphite
• Controlling electron-phonon interactions in graphene at ultra high carrier densities
• The optical conductivity of graphene in the visible region of the spectrum
• Excitonic Effects on the Optical Response of Graphene and Bilayer Graphene
• Spectroscopic ellipsometry of graphene and an exciton-shifted van Hove peak in absorption
• Unusual Microwave Response of Dirac Quasiparticles in Graphene
• Optical and magneto-optical far-infrared properties of bilayer graphene
• The Role of Electron-electron Interactions in Graphene ARPES Spectra
• Many-body interactions in quasi-freestanding graphene
• {\it Ab--initio} finite temperature excitons
• Effect of electron-electron interactions on the conductivity of clean graphene
• Drude weight, plasmon dispersion, and a.c. conductivity in doped graphene sheets
• Inelastic carrier lifetime in graphene
• Conductivity of suspended and non-suspended graphene at finite gate voltage
• Photo-excited Carrier Dynamics and Impact Excitation Cascade in Graphene
• First-Principles Study of Electron Linewidths in Graphene
• Excitonic effects in the optical conductivity of gated graphene

Cited by in corpus (24)

• Measurement of the optical dielectric function of transition metal dichalcogenide monolayers: MoS2, MoSe2, WS2 and WSe2
• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Raman Spectroscopy of Electrochemically-Gated Graphene Transistors: Geometrical Capacitance, Electron-Phonon, Electron-Electron, and Electron-Defect Scattering
• Introducing strong correlation effects into graphene by gadolinium intercalation
• Nonlinear photocurrents in two-dimensional systems based on graphene and boron nitride
• Two-dimensional analysis of the double-resonant 2D Raman mode in bilayer graphene
• Origin of the flat band in heavily Cs doped graphene
• Chemical Vapor Deposition Growth of Boron-Carbon-Nitrogen layers from Methylamine Borane Thermolysis Products
• Theoretical methods for excitonic physics in two-dimensional materials
• Optical conductivity renormalization of graphene on SrTiO${}_3$ due to resonant excitonic effects mediated by Ti 3\textit{d} orbitals
• Phonon-assisted processes in the ultraviolet transient optical response of graphene
• Enhanced optical conductivity and many-body effects in strongly-driven photo-excited semi-metallic graphite
• Plasmon-pole approximation for many-body-effects in extrinsic graphene
• The saddle-point exciton signature on high harmonic generation in 2D hexagonal nanostructures
• Optical conductivity signatures of open Dirac nodal lines
• Probing the bright exciton state in twisted bilayer graphene via resonant Raman scattering
• A study of the nonlinear optical response of the plain graphene and gapped graphene monolayers beyond the Dirac approximation
• Tuning Fe Nucleation Density with Charge Doping of Graphene Substrate
• Third harmonic generation of undoped graphene in Hartree-Fock approximation
• Mass inversion at the Lifshitz transition in monolayer graphene by diffusive, high-density, on-chip, doping
• Ab Initio Modeling of Phonon-Assisted Relaxation of Electrons and Excitons in Semiconductor Nanocrystals for Multiexciton Generation
• Sustained biexciton emission in colloidal quantum wells assisted by dopant-host interaction
• Designable exciton mixing through layer alignment in WS${}_2$-graphene heterostructures
• Tuning the electronic and optical properties of hg-C${}_3$N${}_4$, quantum dots with edge-functionalization: A computational perspective