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Control of electron-electron interaction in graphene by proximity screening

Author

Listed:
  • M. Kim

    (University of Manchester)

  • S. G. Xu

    (University of Manchester
    University of Manchester)

  • A. I. Berdyugin

    (University of Manchester)

  • A. Principi

    (University of Manchester)

  • S. Slizovskiy

    (University of Manchester
    University of Manchester
    Saint-Petersburg INP)

  • N. Xin

    (University of Manchester
    University of Manchester)

  • P. Kumaravadivel

    (University of Manchester
    University of Manchester)

  • W. Kuang

    (University of Manchester)

  • M. Hamer

    (University of Manchester)

  • R. Krishna Kumar

    (University of Manchester)

  • R. V. Gorbachev

    (University of Manchester)

  • K. Watanabe

    (National Institute for Materials Science)

  • T. Taniguchi

    (National Institute for Materials Science)

  • I. V. Grigorieva

    (University of Manchester)

  • V. I. Fal’ko

    (University of Manchester
    University of Manchester)

  • M. Polini

    (University of Manchester
    Dipartimento di Fisica dell’Università di Pisa
    Graphene Labs)

  • A. K. Geim

    (University of Manchester
    University of Manchester)

Abstract

Electron-electron interactions play a critical role in many condensed matter phenomena, and it is tempting to find a way to control them by changing the interactions’ strength. One possible approach is to place a studied system in proximity of a metal, which induces additional screening and hence suppresses electron interactions. Here, using devices with atomically-thin gate dielectrics and atomically-flat metallic gates, we measure the electron-electron scattering length in graphene and report qualitative deviations from the standard behavior. The changes induced by screening become important only at gate dielectric thicknesses of a few nm, much smaller than a typical separation between electrons. Our theoretical analysis agrees well with the scattering rates extracted from measurements of electron viscosity in monolayer graphene and of umklapp electron-electron scattering in graphene superlattices. The results provide a guidance for future attempts to achieve proximity screening of many-body phenomena in two-dimensional systems.

Suggested Citation

  • M. Kim & S. G. Xu & A. I. Berdyugin & A. Principi & S. Slizovskiy & N. Xin & P. Kumaravadivel & W. Kuang & M. Hamer & R. Krishna Kumar & R. V. Gorbachev & K. Watanabe & T. Taniguchi & I. V. Grigorieva, 2020. "Control of electron-electron interaction in graphene by proximity screening," Nature Communications, Nature, vol. 11(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-15829-1
    DOI: 10.1038/s41467-020-15829-1
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    Cited by:

    1. Qing Rao & Wun-Hao Kang & Hongxia Xue & Ziqing Ye & Xuemeng Feng & Kenji Watanabe & Takashi Taniguchi & Ning Wang & Ming-Hao Liu & Dong-Keun Ki, 2023. "Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe2," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. Yotam Wolf & Amit Aharon-Steinberg & Binghai Yan & Tobias Holder, 2023. "Para-hydrodynamics from weak surface scattering in ultraclean thin flakes," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    3. Dongfei Wang & De-Liang Bao & Qi Zheng & Chang-Tian Wang & Shiyong Wang & Peng Fan & Shantanu Mishra & Lei Tao & Yao Xiao & Li Huang & Xinliang Feng & Klaus Müllen & Yu-Yang Zhang & Roman Fasel & Pasc, 2023. "Twisted bilayer zigzag-graphene nanoribbon junctions with tunable edge states," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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