Ytterbium-driven strong enhancement of electron-phonon coupling in graphene

Choongyu Hwang, Duck Young Kim, D. A. Siegel, Kevin T. Chan, J. Noffsinger, A. V. Fedorov, Marvin L. Cohen, Börje Johansson, J. B. Neaton, and A. Lanzara
Phys. Rev. B 90, 115417 – Published 15 September 2014

Abstract

We present a high-resolution angle-resolved photoemission spectroscopy study in conjunction with first-principles calculations to investigate how the interaction of electrons with phonons in graphene is modified by the presence of Yb. We find that the charges transferred from Yb to the graphene layer hybridize with the graphene π bands, leading to a strong enhancement of the electron-phonon interaction. Specifically, the electron-phonon coupling constant is increased by as much as a factor of 10 upon the introduction of Yb with respect to as-grown graphene (0.05). The observed coupling constant constitutes the highest value ever measured for graphene and suggests that the hybridization between graphene and the adatoms might be a critical parameter in realizing superconducting graphene.

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  • Received 3 February 2014

DOI:https://doi.org/10.1103/PhysRevB.90.115417

©2014 American Physical Society

Authors & Affiliations

Choongyu Hwang1,2,*, Duck Young Kim3, D. A. Siegel1,4, Kevin T. Chan1,4, J. Noffsinger1,4, A. V. Fedorov5, Marvin L. Cohen1,4, Börje Johansson6, J. B. Neaton4,7,8, and A. Lanzara1,4,†

  • 1Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 2Department of Physics, Pusan National University, Busan 609-735, Republic of Korea
  • 3Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA
  • 4Department of Physics, University of California, Berkeley, Berkeley, California 94720, USA
  • 5Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 6Department of Materials and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
  • 7The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 8Kavli Energy Nanosciences Institute at Berkeley, Berkeley, California 94720, USA

  • *ckhwang@pusan.ac.kr
  • ALanzara@lbl.gov

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Vol. 90, Iss. 11 — 15 September 2014

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