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원자제어 저차원 전자계 연구단
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Sublattice Interference as the Origin of σ Band Kinks in Graphene

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Title
Sublattice Interference as the Origin of σ Band Kinks in Graphene
Author(s)
Sung Won Jung; Woo Jong Shin; Jimin Kim; Luca Moreschini; Han Woong Yeom; Rotenberg E.; Bostwick A.; Keun Su Kim
Publication Date
2016-05
Journal
PHYSICAL REVIEW LETTERS, v.116, no.18, pp.186802 -
Publisher
AMER PHYSICAL SOC
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. © 2016 American Physical Society
URI
http://pr.ibs.re.kr/handle/8788114/2901
DOI
10.1103/PhysRevLett.116.186802
ISSN
0031-9007
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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