Journal
PHYSICAL REVIEW LETTERS
Volume 116, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.186802
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Funding
- U.S. Department of Energy, Office of Sciences [DE-AC02-05CH11231]
- [IBS-R014-D1]
- Ministry of Science, ICT & Future Planning, Republic of Korea [IBS-R014-D1-2016-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2016H1A2A1908988] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 sigma bands of graphene, where anomalous kinks at energies as high as similar to 4 eV were reported recently [Phys. Rev. Lett. 111, 216806 (2013)]. We found that two s 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.
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