Sublattice Interference as the Origin of σ Band Kinks in Graphene

Sung Won Jung, Woo Jong Shin, Jimin Kim, Luca Moreschini, Han Woong Yeom, Eli Rotenberg, Aaron Bostwick, Keun Su Kim

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12 Citations (Scopus)


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 σ bands of graphene, where anomalous kinks at energies as high as ∼4 eV were reported recently [Phys. Rev. Lett. 111, 216806 (2013)]. We found that two σ 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.

Original languageEnglish
Article number186802
JournalPhysical review letters
Issue number18
Publication statusPublished - 2016 May 5

Bibliographical note

Funding Information:
This work was supported by IBS-R014-D1. The ALS was supported by the U.S. Department of Energy, Office of Sciences, under Contract No. DE-AC02-05CH11231. We thank J. Denlinger and Y.K. Kim for help with experiments, and S.-H. Jhi, S.-H. Lee, and D. Cho for valuable discussions.

Publisher Copyright:
© 2016 American Physical Society.

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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