Gate-Tunable Anomalous Hall Effect From the Interaction of the van der Waals Antiferromagnet CrI<sub>3</sub> with a Topological-Insulator Surface State

ORAL

Abstract

The coupling between topological insulators and magnetic materials can induce exotic topological states which may have useful applications for the development of novel spintronic devices. In this study, we demonstrate the coupling between the 3D topological insulator BiSbTeSe2 and the 2D layered antiferromagnet CrI3. Specifically, we assembled a CrI3/BiSbTeSe2 heterostructure encapsulated in hexagonal boron nitride (hBN) via stacking of exfoliated few-layer flakes, and observed a large anomalous Hall effect at 4.5 K. We tune the Fermi level of the surface state via electrostatic gating and thereby control the strength of the anomalous Hall signal. We will compare and contrast the results from using antiferromagnetic CrI3 versus ferromagnetic Cr2Ge2Te6.

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Presenters

  • Benjamin S Huang

    • Cornell University

Authors

  • Benjamin S Huang

    • Cornell University

  • Rakshit Jain

    • Cornell University

  • Matthew S Roddy

    • Cornell University

  • Husain F Alnaser

    • University of Utah

  • Amit Vashist

    • University of Utah

  • Vikram V Deshpande

    • University of Utah

  • 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

  • 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

  • Taylor D Sparks

    • University of Utah

  • Daniel C Ralph

    • Cornell University