Sublattice Interference as the Origin of sigma Band Kinks in Graphene
SCIE
SCOPUS
- Title
- Sublattice Interference as the Origin of sigma Band Kinks in Graphene
- Authors
- Jung, SW; Shin, WJ; Kim, J; Moreschini, L; Yeom, HW; Rotenberg, E; Bostwick, A; Kim, KS
- Date Issued
- 2016-05-05
- Publisher
- American Physical Society
- 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 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/37466
- DOI
- 10.1103/PhysRevLett.116.186802
- ISSN
- 0031-9007
- Article Type
- Article
- Citation
- Physical Review Letters, vol. 116, no. 18, 2016-05-05
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