Topological switch in a near room temperature van der Waals ferromagnet

ORAL

Abstract

Two-dimensional (2D) van der Waals magnets have offered a large playground for exploring exotic correlated phenomena emerging from the interplay between dimensionality, magnetism, and topology. Their versality also allows a stronger tunability under various experimental tuning knobs. We will present the evidence for a switchable topological phase in a metallic near room temperature van der Waals ferromagnet from high resolution angle-resolved photoemission spectroscopy measurements supported by a combination of other experimental techniques and theoretical models. We will demonstrate the topological switching to hinge upon a symmetry change that results in a switching of the electronic state between a magnetic Weyl nodal line phase and a geometrical flat bands phase. Our work not only reveals a rich range of quantum phases emergent in 2D van der Waals ferromagnets, but also uncovers the potential of utilizing site occupancy as a novel degree of freedom for tuning symmetry and therefore topology in quantum materials for the realization of exotic emergent phases.

*M.Y. acknowledges the support from U.S. DOE grant No. DE-SC0021421 and the Gordon and Betty Moore Foundation's EPiQS Initiative through grant no. GBMF9470.

–

Presenters

  • Han Wu

    • Rice University

Authors

  • Han Wu

    • Rice University

  • Lei Chen

    • Rice University

  • Paul T Malinowski

    • University of Washington

  • Jianwei Huang

    • Rice University

  • Qinwen Deng

    • University of Pennsylvania

  • Kirsty Scott

    • Yale University

  • Bo Gyu Jang

    • Los Alamos National Laboratory

  • Jacob Ruff

    • Cornell University

  • Ziqin Yue

    • Rice University

  • Elio Vescovo

    • Brookhaven National Laboratory
    • Brookhaven National Lab

  • Sung-Kwan Mo

    • Lawrence Berkeley National Laboratory

  • Jonathan D Denlinger

    • Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Laboratory, Berkeley, California

  • Donghui Lu

    • SLAC - Natl Accelerator Lab

  • Makoto Hashimoto

    • SLAC - Natl Accelerator Lab

  • Yu He

    • Yale University

  • Pengcheng Dai

    • Rice University

  • Yimo Han

    • Rice University

  • Robert J Birgeneau

    • University of California, Berkeley

  • Jianxin Zhu

    • Los Alamos Natl Lab
    • Los Alamos National Lab
    • Los Alamos National Laboratory

  • Eduardo H Da Silva Neto

    • Yale University
    • University of California, Davis

  • Liang Wu

    • University of Pennsylvania

  • Jiun-Haw Chu

    • University of Washington
    • University of Washington, Seattle, Washington, USA

  • Qimiao Si

    • Rice University

  • Ming Yi

    • Rice University