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- W2461464984 abstract "Kinks near the Fermi level observed in angle-resolved photoemission spectroscopy (ARPES) have been widely accepted to represent electronic coupling to collective excitations, but kinks at higher energies have eluded a unified description. We identify the mechanism leading to such kink features by means of ARPES and tight-binding band calculations on $ensuremath{sigma}$ bands of graphene, where anomalous kinks at energies as high as $ensuremath{sim}4text{ }text{ }mathrm{eV}$ were reported recently [Phys. Rev. Lett. 111, 216806 (2013)]. We found that two $ensuremath{sigma}$ bands show a strong intensity modulation with abruptly vanishing intensity near the kink features, which is due to sublattice interference. The interference induced local singularity in the matrix element is a critical factor that gives rise to apparent kink features, as confirmed by our spectral simulations without involving any coupling to collective excitations." @default.
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- W2461464984 date "2016-05-05" @default.
- W2461464984 modified "2023-09-27" @default.
- W2461464984 title "Sublattice Interference as the Origin of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>σ</mml:mi></mml:math>Band Kinks in Graphene" @default.
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- W2461464984 doi "https://doi.org/10.1103/physrevlett.116.186802" @default.
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