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

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

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 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
Volume116
Issue number18
DOIs
Publication statusPublished - 2016 May 5

Bibliographical note

Publisher Copyright:
© 2016 American Physical Society.

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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