Emergent quantum Hall ground states driven by proximity exchange coupling in 2D material/ferromagnet interfaces

ORAL

Abstract

In hBN/Graphene/EuS layer system we observe phase transitions spanning various quantum Hall regimes from quantum spin Hall edge state to anti-ferromagnetic state via an intermediate canted anti ferromagnetic (CAF) state. This is first demonstration of quantum Hall ferromagnetic ground states driven by proximity coupling with a ferromagnetic insulator (resulting in a huge exchange field) and achieved at a much lower applied magnetic field than any study in the past. The results clearly demonstrate the opening of edge state corresponding to CAF gap, while at much higher fields we observe reentrant insulating phase corresponding to the bulk gap as predicted by theory [1]. We also investigate the effects with WS2/Graphene/EuS stack. This led to interesting ground states emerging as a result of ferromagnet and SOC coupling induced by proximity effects. In this talk we will discuss the details of emergent ground state in 2D material/Ferromagnet interface effects along with future direction.

1. Kharitonov, M. PRL 109, 046803 (2012), PRB 85, 155439 (2012), PRB 86, 075450 (2012)

*CIQM-NSF DMR1231319 NSG-DMR1700137 ONR N00014-16-1-2657

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Presenters

  • Dhavala Suri

    • Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center, Massachusetts Institute of Technology
    • Plasma Science and Fusion Center, and Francis Bitter Magnet Laboratory, MIT
    • MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    • Massachusetts Institute of Technology MIT

Authors

  • Dhavala Suri

    • Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center, Massachusetts Institute of Technology
    • Plasma Science and Fusion Center, and Francis Bitter Magnet Laboratory, MIT
    • MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    • Massachusetts Institute of Technology MIT

  • Andrew Saydjari

    • Harvard University

  • Lingyi Zhong

    • Fudan University

  • Siddharth Omar

    • University of Groningen

  • Zhongxun Guo

    • Fudan University

  • Mason Gray

    • Boston College

  • Mirko Rocci

    • Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center, Massachusetts Institute of Technology
    • MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    • Massachusetts Institute of Technology MIT

  • Kenneth Burch

    • Boston College
    • Boston college

  • Wenzhong Bao

    • Fudan University

  • Bart Van Wees

    • University of Groningen

  • Patrick A Lee

    • Department of Physics, Massachusetts Institute of Technology
    • MIT
    • Hong Kong University of Science and Technology
    • MASSACHUSETTS INSTITUTE OF TECHNOLOGY

  • Amir Yacoby

    • Harvard University
    • Department of Physics, Harvard University
    • Physics, Harvard University
    • Department of Physics, Harvard University, Cambridge, MA, 02138, USA

  • Peng Wei

    • University of California, Riverside
    • University of California Riverside
    • Department of Physics and Astronomy, University of California, Riverside

  • Jagadeesh Moodera

    • Department of Physics, Massachusetts Institute of Technology
    • Plasma Science and Fusion Center, and Francis Bitter Magnet Laboratory, and Department of Physics, MIT
    • Massachusetts Institute of Technology
    • MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    • Massachusetts Institute of Technology MIT