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 journalArticle

8 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

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kink bands
sublattices
graphene
interference
photoelectric emission
spectroscopy
excitation
modulation
energy
matrices
electronics
simulation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Jung, S. W., Shin, W. J., Kim, J., Moreschini, L., Yeom, H. W., Rotenberg, E., ... Kim, K. S. (2016). Sublattice Interference as the Origin of σ Band Kinks in Graphene. Physical Review Letters, 116(18), [186802]. https://doi.org/10.1103/PhysRevLett.116.186802
Jung, Sung Won ; Shin, Woo Jong ; Kim, Jimin ; Moreschini, Luca ; Yeom, Han Woong ; Rotenberg, Eli ; Bostwick, Aaron ; Kim, Keun Su. / Sublattice Interference as the Origin of σ Band Kinks in Graphene. In: Physical Review Letters. 2016 ; Vol. 116, No. 18.
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Jung, SW, Shin, WJ, Kim, J, Moreschini, L, Yeom, HW, Rotenberg, E, Bostwick, A & Kim, KS 2016, 'Sublattice Interference as the Origin of σ Band Kinks in Graphene', Physical Review Letters, vol. 116, no. 18, 186802. https://doi.org/10.1103/PhysRevLett.116.186802

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 journalArticle

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AU - Jung, Sung Won

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AU - Rotenberg, Eli

AU - Bostwick, Aaron

AU - Kim, Keun Su

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Jung SW, Shin WJ, Kim J, Moreschini L, Yeom HW, Rotenberg E et al. Sublattice Interference as the Origin of σ Band Kinks in Graphene. Physical Review Letters. 2016 May 5;116(18). 186802. https://doi.org/10.1103/PhysRevLett.116.186802