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Electronic cooling via interlayer Coulomb coupling in multilayer epitaxial graphene

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  • Momchil T. Mihnev

    (University of Michigan
    Center for Ultrafast Optical Science, University of Michigan)

  • John R. Tolsma

    (The University of Texas at Austin)

  • Charles J. Divin

    (University of Michigan
    Center for Ultrafast Optical Science, University of Michigan)

  • Dong Sun

    (Center for Ultrafast Optical Science, University of Michigan
    International Center for Quantum Materials, School of Physics, Peking University)

  • Reza Asgari

    (School of Physics, Institute for Research in Fundamental Sciences (IPM))

  • Marco Polini

    (NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore
    Istituto Italiano di Tecnologia, Graphene Labs)

  • Claire Berger

    (School of Physics, Georgia Institute of Technology
    Institut Neel, CNRS UJF-INP)

  • Walt A. de Heer

    (School of Physics, Georgia Institute of Technology
    King Abdulaziz University)

  • Allan H. MacDonald

    (The University of Texas at Austin)

  • Theodore B. Norris

    (University of Michigan
    Center for Ultrafast Optical Science, University of Michigan)

Abstract

In van der Waals bonded or rotationally disordered multilayer stacks of two-dimensional (2D) materials, the electronic states remain tightly confined within individual 2D layers. As a result, electron–phonon interactions occur primarily within layers and interlayer electrical conductivities are low. In addition, strong covalent in-plane intralayer bonding combined with weak van der Waals interlayer bonding results in weak phonon-mediated thermal coupling between the layers. We demonstrate here, however, that Coulomb interactions between electrons in different layers of multilayer epitaxial graphene provide an important mechanism for interlayer thermal transport, even though all electronic states are strongly confined within individual 2D layers. This effect is manifested in the relaxation dynamics of hot carriers in ultrafast time-resolved terahertz spectroscopy. We develop a theory of interlayer Coulomb coupling containing no free parameters that accounts for the experimentally observed trends in hot-carrier dynamics as temperature and the number of layers is varied.

Suggested Citation

  • Momchil T. Mihnev & John R. Tolsma & Charles J. Divin & Dong Sun & Reza Asgari & Marco Polini & Claire Berger & Walt A. de Heer & Allan H. MacDonald & Theodore B. Norris, 2015. "Electronic cooling via interlayer Coulomb coupling in multilayer epitaxial graphene," Nature Communications, Nature, vol. 6(1), pages 1-11, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9105
    DOI: 10.1038/ncomms9105
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