Quantum Hall effect in a monolayer graphene magnetized by an antiferromagnet

ORAL

Abstract

We experimentally demonstrate the quantum Hall effect in a monolayer graphene magnetized by an underlying layer of an antiferromagnet. When interfacing with the AFM, the π bond formed by the p orbitals of carbon is found to sufficiently overlap with the Cr atoms in the AFM layer, and therefore experiences a sizeable Hund's-rule exchange energy. Through field-cooling, the change in the antiferromagnetic order modifies the spin splitting, and thereby shifts quantum Hall plateau, as well as the SdH oscillation. This transport behavior is then used to quantitatively estimate the spin split energy ( about several hundreds of meV ).

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Presenters

  • Yingying Wu

    Electrical Engineering, University of California, Los Angeles, University of California, Los Angeles

Authors

  • Yingying Wu

    Electrical Engineering, University of California, Los Angeles, University of California, Los Angeles

  • Gen Yin

    University of California, Los Angeles

  • Lei Pan

    Electrical Engineering, University of California, Los Angeles, University of California, Los Angeles, University of California Los Angeles, Department of Electrical Engineering, University of California, Los Angeles, Electrical and Computer Engineering Department, University of California, Los Angeles

  • Alexander Grutter

    National Institute of Standards and Technology, NIST, NIST Center for Neutron Research, NIST Gaithersburg, Neutron-Condensed Matter Science Group, NIST, NIST Center for Neutron Research

  • Kang L. Wang

    University of California, Los Angeles, University of California Los Angeles, ECE, UCLA, Electrical and Computer Engineering Department, University of California, Los Angeles