Optical characterization of electron-phonon interactions at the saddle point in graphene

Abstract

The role of electron-phonon interactions is experimentally and theoretically investigated near the saddle point absorption peak of graphene. The differential optical transmission spectra of multiple, non-interacting layers of graphene reveals the dominant role played by electron-acoustic phonon coupling in bandstructure renormalization. Using a Born approximation for electron-phonon coupling and experimental estimates of the dynamic phonon lattice temperature, we deduce the effective acoustic deformation potential to be $D_{\mathrm{eff}}^{\mathrm{ac}}\simeq 5$eV. This value is in accord with recent theoretical predictions but differs substantially from those obtained using electrical transport measurements.

5 pages, 3 figures

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Cited by in corpus (9)

• Ultrafast dynamics of electrons and phonons: from the two-temperature model to the time-dependent Boltzmann equation
• Microscopic description of intraband absorption in graphene: the occurrence of transient negative differential transmission
• Scanning tunneling microscopy and spectroscopy of twisted trilayer graphene
• Photoemission Signatures of Non-Equilibrium Carrier Dynamics from First Principles
• Phonon-assisted processes in the ultraviolet transient optical response of graphene
• Inelastic scattering and cooling of photoexcited electrons through coupling with acoustic, optic and surface polar optic phonons in graphene
• Pumping electrons in graphene to the $\mathbf{M}$-point in the Brillouin zone: The emergence of anisotropic plasmons
• Giant Shear Displacement by Light-Induced Raman Force in Bilayer Graphene
• Evidence of electron-electron interactions around Van Hove singularities of a graphene Moiré superlattice