Thermal transport through the ν=0 quantum Hall state in monolayer graphene

ORAL

Abstract

The ν=0 quantum Hall state in graphene has garnered both theoretical and experimental attention attributable to its various competing ground states: spin-polarized ferromagnetic, canted antiferromagnetic, Kekulé distortion, and charge density wave. Theoretical predictions indicate the possibility of gapless excitations which should lead to nonzero thermal transport through the insulating state. This expected violation of the Wiedemann-Franz law offers a convenient experimental probe as electronic transport measurements remain difficult in this system due to the exceedingly high resistance. Here we present our results attempting to uncover the nature of the competing ground states through a series of thermal noise measurements, following prior experimental work to measure thermal conductance in quantum Hall systems.

*Sample fabrication and transport measurements by J.C., C.C., J.M., and G.F., were supported by the Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, U.S. Department of Energy, under Award No. DE-SC0002765. K.W. and T.T. acknowledge support from JSPS KAKENHI (Grant Numbers 19H05790, 20H00354, and 21H05233).

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Presenters

  • John Chiles

    • Duke University

Authors

  • John Chiles

    • Duke University

  • Chun-Chia Chen

    • Duke University

  • Jordan McCourt

    • Duke University

  • Kenji Watanabe

    • National Institute for Materials Science
    • NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • Research Center for Functional Materials, National Institute of Material Science, Tsukuba, Japan
    • National Institute of Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science

  • Takashi Taniguchi

    • National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute of Material Science, Tsukuba, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science

  • Gleb Finkelstein

    • Duke University