Thermal probe of correlated states in graphene systems

ORAL

Abstract

It has been shown that thermopower is proportional to the transport entropy of a clean non-interacting 2D electron system. This relation still holds in the presence of a high magnetic field and for strongly interacting electrons. In this talk, I will present magneto-thermopower measurements of high-quality monolayer and Bernal stacked bilayer graphene (BLG) both in integer and fractional quantum hall (FQH) regime. Our result indicates that thermopower as a measure of entropy is a more sensitive probe of correlated states compared to resistivity measurements. We also perform temperature and magnetic field dependence to further characterize the observed correlated states.

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Presenters

  • Nishat Sultana

    • George Mason University

Authors

  • Nishat Sultana

    • George Mason University

  • Robert W Rienstra

    • George Mason 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

  • Joseph A Stroscio

    • National Institute of Standards and Technology (NIST)

  • Nikolai Zhitenev

    • National Institute of Standards and Technology, Gaithersburg
    • National Institute of Standards & Technology

  • D. E Feldman

    • Brown University

  • Fereshte Ghahari

    • George Mason University