Thermal probe of correlated states in bilayer graphene

ORAL

Abstract

Measurement of thermodynamic properties at half-filled Landau levels (LLs) such as thermoelectric power (TEP) can offer a view which is distinct from that offered by other techniques. For example, in the case of a clean non-interacting 2D electron system, it has been shown that TEP is proportional to the transport entropy of the 2D electron system. A similar connection between TEP and entropy was later proved to hold for strongly interacting electrons in high magnetic fields. This makes TEP a powerful tool to reveal statistical properties of FQH states as the entropy carried by non-Abelian quasiparticles is predicted to be anomalously large. In this talk, I will present magneto-TEP studies of high-quality Bernal stacked bilayer graphene devices which exhibit well-developed FQH states at relatively low magnetic fields. Our data indicates that TEP can be a more sensitive probe of FQH states compared to resistivity measurements. The observed FQH states are being studied further by temperature and magnetic field dependence TEP measurements to probe their topological properties.

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Presenters

  • Nishat Sultana

    • George Mason University

Authors

  • Nishat Sultana

    • George Mason University

  • Robert W Rienstra

    • George Mason University

  • Takashi Taniguchi

    • Kyoto Univ
    • National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Sciences
    • NIMS
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, NIMS, Japan
    • International Center for Materials Nanoarchitectonics, Tsukuba
    • National Institue for Materials Science
    • Kyoto University
    • National Institute of Materials Science
    • International Center for Materials Nanoarchitectonics and National Institute for Materials Science

  • Kenji Watanabe

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

  • Joseph A Stroscio

    • National Institute of Standards and Technology
    • National Institute of Standards and Tech

  • Nikolai Zhitenev

    • National Institute of Standarts and Technologies
    • National Institute of Standards and Technology

  • Fereshte Ghahari

    • George Mason University