Electron-phonon coupling origin of the graphene π*-band kink via isotope effect

F. Bisti, F. Priante, A. V. Fedorov, M. Donarelli, M. Fantasia, L. Petaccia, O. Frank, M. Kalbac, G. Profeta, A. Grüneis, and L. Ottaviano
Phys. Rev. B 103, 035119 – Published 14 January 2021
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Abstract

The π*-band renormalization of Li-doped quasifreestanding graphene has been investigated by means of isotope (C13) substitution and angle-resolved photoemission spectroscopy. The well documented sudden slope change (known as “kink”) located at 169 meV from the Fermi level in the graphene made of C12 atoms shifts to 162 meV once the carbon monolayer is composed by C13 isotope. Such an energy shift is in excellent agreement with the expected softening of the phonon energy distribution due to the isotope substitution and provides, therefore, an indisputable experimental proof of the electron-phonon coupling origin of this well known many-body feature in the electronic structure of graphene.

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  • Received 19 June 2020
  • Revised 6 November 2020
  • Accepted 15 December 2020

DOI:https://doi.org/10.1103/PhysRevB.103.035119

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

F. Bisti1,2,*, F. Priante1,†, A. V. Fedorov3,4, M. Donarelli1, M. Fantasia1, L. Petaccia5, O. Frank6, M. Kalbac6, G. Profeta1,7, A. Grüneis8, and L. Ottaviano1,7

  • 1Dipartimento di Scienze Fisiche e Chimiche, Università dell'Aquila, Via Vetoio 10, 67100 L'Aquila, Italy
  • 2ALBA Synchrotron Light Source, 08290 Cerdanyola del Vallès, Spain
  • 3IFW Dresden, Leibniz Institute for Solid State and Materials Research, D-01171 Dresden, Germany
  • 4Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany
  • 5Elettra Sincrotrone Trieste, Strada Statale 14 km 163.5, 34149 Trieste, Italy
  • 6J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences, Dolejškova 3, CZ-18223 Prague 8, Czech Republic
  • 7CNR-SPIN L'Aquila, Via Vetoio 10, 67100 L'Aquila, Italy
  • 8II Institute of Physics, University of Cologne, Zülpicher Strasse 77, 50937 Cologne, Germany

  • *fbisti@cells.es
  • fabio.priante@aalto.fi

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Issue

Vol. 103, Iss. 3 — 15 January 2021

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