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Strong magnetophonon oscillations in extra-large graphene

Author

Listed:
  • P. Kumaravadivel

    (University of Manchester
    University of Manchester)

  • M. T. Greenaway

    (Loughborough University
    University of Nottingham)

  • D. Perello

    (University of Manchester
    University of Manchester)

  • A. Berdyugin

    (University of Manchester)

  • J. Birkbeck

    (University of Manchester
    University of Manchester)

  • J. Wengraf

    (University of Manchester
    University of Lancaster)

  • S. Liu

    (Kansas State University)

  • J. H. Edgar

    (Kansas State University)

  • A. K. Geim

    (University of Manchester
    University of Manchester)

  • L. Eaves

    (University of Manchester
    University of Nottingham)

  • R. Krishna Kumar

    (University of Manchester)

Abstract

Van der Waals materials and their heterostructures offer a versatile platform for studying a variety of quantum transport phenomena due to their unique crystalline properties and the exceptional ability in tuning their electronic spectrum. However, most experiments are limited to devices that have lateral dimensions of only a few micrometres. Here, we perform magnetotransport measurements on graphene/hexagonal boron-nitride Hall bars and show that wider devices reveal additional quantum effects. In devices wider than ten micrometres we observe distinct magnetoresistance oscillations that are caused by resonant scattering of Landau-quantised Dirac electrons by acoustic phonons in graphene. The study allows us to accurately determine graphene’s low energy phonon dispersion curves and shows that transverse acoustic modes cause most of phonon scattering. Our work highlights the crucial importance of device width when probing quantum effects and also demonstrates a precise, spectroscopic method for studying electron-phonon interactions in van der Waals heterostructures.

Suggested Citation

  • P. Kumaravadivel & M. T. Greenaway & D. Perello & A. Berdyugin & J. Birkbeck & J. Wengraf & S. Liu & J. H. Edgar & A. K. Geim & L. Eaves & R. Krishna Kumar, 2019. "Strong magnetophonon oscillations in extra-large graphene," Nature Communications, Nature, vol. 10(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-11379-3
    DOI: 10.1038/s41467-019-11379-3
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    Cited by:

    1. Aaron H. Barajas-Aguilar & Jasen Zion & Ian Sequeira & Andrew Z. Barabas & Takashi Taniguchi & Kenji Watanabe & Eric B. Barrett & Thomas Scaffidi & Javier D. Sanchez-Yamagishi, 2024. "Electrically driven amplification of terahertz acoustic waves in graphene," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    2. Daniel Vaquero & Vito Clericò & Michael Schmitz & Juan Antonio Delgado-Notario & Adrian Martín-Ramos & Juan Salvador-Sánchez & Claudius S. A. Müller & Km Rubi & Kenji Watanabe & Takashi Taniguchi & Be, 2023. "Phonon-mediated room-temperature quantum Hall transport in graphene," Nature Communications, Nature, vol. 14(1), pages 1-6, December.
    3. M. T. Greenaway & P. Kumaravadivel & J. Wengraf & L. A. Ponomarenko & A. I. Berdyugin & J. Li & J. H. Edgar & R. Krishna Kumar & A. K. Geim & L. Eaves, 2021. "Graphene’s non-equilibrium fermions reveal Doppler-shifted magnetophonon resonances accompanied by Mach supersonic and Landau velocity effects," Nature Communications, Nature, vol. 12(1), pages 1-6, December.

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