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 language | English |
|---|---|
| Article number | 186802 |
| Journal | Physical Review Letters |
| Volume | 116 |
| Issue number | 18 |
| DOIs | |
| Publication status | Published - 2016 May 5 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
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Sublattice Interference as the Origin of σ Band Kinks in Graphene. / Jung, Sung Won; Shin, Woo Jong; Kim, Jimin; Moreschini, Luca; Yeom, Han Woong; Rotenberg, Eli; Bostwick, Aaron; Kim, Keun Su.
In: Physical Review Letters, Vol. 116, No. 18, 186802, 05.05.2016.Research output: Contribution to journal › Article
TY - JOUR
T1 - Sublattice Interference as the Origin of σ Band Kinks in Graphene
AU - Jung, Sung Won
AU - Shin, Woo Jong
AU - Kim, Jimin
AU - Moreschini, Luca
AU - Yeom, Han Woong
AU - Rotenberg, Eli
AU - Bostwick, Aaron
AU - Kim, Keun Su
PY - 2016/5/5
Y1 - 2016/5/5
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.116.186802
DO - 10.1103/PhysRevLett.116.186802
M3 - Article
AN - SCOPUS:84966349978
VL - 116
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 18
M1 - 186802
ER -