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Phonon-mediated room-temperature quantum Hall transport in graphene

Author

Listed:
  • Daniel Vaquero

    (Universidad de Salamanca)

  • Vito Clericò

    (Universidad de Salamanca)

  • Michael Schmitz

    (RWTH Aachen University
    Forschungszentrum Jülich)

  • Juan Antonio Delgado-Notario

    (Universidad de Salamanca
    Polish Academy of Sciences)

  • Adrian Martín-Ramos

    (Universidad de Salamanca)

  • Juan Salvador-Sánchez

    (Universidad de Salamanca)

  • Claudius S. A. Müller

    (Radboud University
    Radboud University, Institute for Molecules and Materials)

  • Km Rubi

    (Radboud University
    Radboud University, Institute for Molecules and Materials)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Bernd Beschoten

    (RWTH Aachen University)

  • Christoph Stampfer

    (RWTH Aachen University
    Forschungszentrum Jülich)

  • Enrique Diez

    (Universidad de Salamanca)

  • Mikhail I. Katsnelson

    (Radboud University, Institute for Molecules and Materials)

  • Uli Zeitler

    (Radboud University
    Radboud University, Institute for Molecules and Materials)

  • Steffen Wiedmann

    (Radboud University
    Radboud University, Institute for Molecules and Materials)

  • Sergio Pezzini

    (NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore)

Abstract

The quantum Hall (QH) effect in two-dimensional electron systems (2DESs) is conventionally observed at liquid-helium temperatures, where lattice vibrations are strongly suppressed and bulk carrier scattering is dominated by disorder. However, due to large Landau level (LL) separation (~2000 K at B = 30 T), graphene can support the QH effect up to room temperature (RT), concomitant with a non-negligible population of acoustic phonons with a wave-vector commensurate to the inverse electronic magnetic length. Here, we demonstrate that graphene encapsulated in hexagonal boron nitride (hBN) realizes a novel transport regime, where dissipation in the QH phase is governed predominantly by electron-phonon scattering. Investigating thermally-activated transport at filling factor 2 up to RT in an ensemble of back-gated devices, we show that the high B-field behaviour correlates with their zero B-field transport mobility. By this means, we extend the well-accepted notion of phonon-limited resistivity in ultra-clean graphene to a hitherto unexplored high-field realm.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-35986-3
    DOI: 10.1038/s41467-023-35986-3
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    References listed on IDEAS

    as
    1. 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.
    2. C. Neumann & S. Reichardt & P. Venezuela & M. Drögeler & L. Banszerus & M. Schmitz & K. Watanabe & T. Taniguchi & F. Mauri & B. Beschoten & S. V. Rotkin & C. Stampfer, 2015. "Raman spectroscopy as probe of nanometre-scale strain variations in graphene," Nature Communications, Nature, vol. 6(1), pages 1-7, December.
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