Strong electron-phonon coupling in the σ band of graphene

Federico Mazzola, Thomas Frederiksen, Thiagarajan Balasubramanian, Philip Hofmann, Bo Hellsing, and Justin W. Wells
Phys. Rev. B 95, 075430 – Published 24 February 2017
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Abstract

First-principles studies of the electron-phonon coupling in graphene predict a high coupling strength for the σ band with λ values of up to 0.9. Near the top of the σ band, λ is found to be 0.7. This value is consistent with the recently observed kinks in the σ band dispersion by angle-resolved photoemission. While the photoemission intensity from the σ band is strongly influenced by matrix elements due to sublattice interference, these effects differ significantly for data taken in the first and neighboring Brillouin zones. This can be exploited to disentangle the influence of matrix elements and electron-phonon coupling. A rigorous analysis of the experimentally determined complex self-energy using Kramers-Kronig transformations further supports the assignment of the observed kinks to strong electron-phonon coupling and yields a coupling constant of 0.6(1), in excellent agreement with the calculations.

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  • Received 5 July 2016
  • Revised 18 October 2016

DOI:https://doi.org/10.1103/PhysRevB.95.075430

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Federico Mazzola1, Thomas Frederiksen2,3, Thiagarajan Balasubramanian4, Philip Hofmann5, Bo Hellsing2,6, and Justin W. Wells1,*

  • 1Department of Physics, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway
  • 2Donostia International Physics Center (DIPC) — UPV/EHU, E-20018 San Sebastián, Spain
  • 3IKERBASQUE, Basque Foundation for Science, E-48013, Bilbao, Spain
  • 4MAX IV Laboratory, PO Box 118, S-22100 Lund, Sweden
  • 5Department of Physics and Astronomy, Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Denmark
  • 6Material and Surface Theory Group, Department of Physics, University of Gothenburg, Sweden

  • *justin.wells@ntnu.no

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Issue

Vol. 95, Iss. 7 — 15 February 2017

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