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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)

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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