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- W2068639283 abstract "We obtain analytical expressions for the electron self-energy and the electron-phonon coupling in electron-doped graphene using electron-phonon matrix elements extracted from density functional theory simulations. From the electron self-energies we calculate angle-resolved photoemission spectra (ARPES). We demonstrate that the measured kink at $ensuremath{approx}ensuremath{-}0.2phantom{rule{0.3em}{0ex}}mathrm{eV}$ from the Fermi level is actually composed of two features, one at $ensuremath{approx}ensuremath{-}0.195phantom{rule{0.3em}{0ex}}mathrm{eV}$ due to the twofold-degenerate ${E}_{2g}$ mode, and a second one at $ensuremath{approx}ensuremath{-}0.16phantom{rule{0.3em}{0ex}}mathrm{eV}$ due to the ${A}_{1}^{ensuremath{'}}$ mode. The electron-phonon coupling extracted from the kink observed in ARPES experiments is roughly a factor of 5.5 larger than the calculated one. This disagreement can be only partially reconciled by the inclusion of resolution effects. Indeed, we show that a finite resolution increases the apparent electron-phonon coupling by underestimating the renormalization of the electron velocity at energies larger than the kink positions. The discrepancy between theory and experiments is thus reduced to a factor of $ensuremath{approx}2.5$. From the linewidth of the calculated ARPES we obtain the electron relaxation time. A comparison with available experimental data in graphene shows that the electron relaxation time detected in ARPES is almost two orders of magnitudes smaller than that measured by other experimental techniques." @default.
- W2068639283 created "2016-06-24" @default.
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- W2068639283 date "2007-11-09" @default.
- W2068639283 modified "2023-09-30" @default.
- W2068639283 title "Electron-phonon coupling and electron self-energy in electron-doped graphene: Calculation of angular-resolved photoemission spectra" @default.
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- W2068639283 doi "https://doi.org/10.1103/physrevb.76.205411" @default.
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