Observation of flat bands in a near room temperature van der Waals Ferromagnet

ORAL

Abstract

The two-dimensional (2D) van der Waals magnets has attracted much attention recently due to their tunability and versatility towards a new generation of spintronic devices. Here we present evidence from high resolution angle-resolved photoemission spectroscopy study of a near room-temperature ferromagnet Fe5-xGeTe2. Interestingly, we resolve a number of electronic dispersions that remain flat across a large portion of the Brillouin zone. In addition, we will present evidence for Dirac crossings that reveal the non-trivial topological properties of this material. The temperature evolution of the electronic structure across Tc will also be discussed. Overall, our observations reveal Fe5-xGeTe2 to be a rich material platform for understanding correlation and magnetism in the presence of non-trivial topology.

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Presenters

  • Han Wu

    • Rice University

Authors

  • Han Wu

    • Rice University

  • Paul T Malinowski

    • University of Washington

  • Yue Shi

    • University of Washington

  • Jianxin Zhu

    • Los Alamos Natl Lab
    • Los Alamos National Laboratory

  • Yu He

    • Yale university
    • Yale University
    • yale university

  • Ji Seop Oh

    • University of California, Berkeley
    • University of California Berkeley
    • University of California Berkeley; Rice University

  • Jianwei Huang

    • Rice University

  • Mason Klemm

    • Rice University

  • Xiaokun Teng

    • Rice University

  • Xiang Chen

    • Lawrence Berkeley National Laboratory

  • Makoto Hashimoto

    • SLAC National Accelerator Laboratory
    • SLAC - Natl Accelerator Lab
    • SLAC National Accelerator Lab

  • Donghui Lu

    • SLAC - Natl Accelerator Lab
    • SLAC National Accelerator Laboratory
    • SLAC National Accelerator Lab

  • Sung-Kwan Mo

    • Lawrence Berkeley National Laboratory

  • Pengcheng Dai

    • Rice Univ
    • Rice University

  • Robert J Birgeneau

    • University of California, Berkeley

  • Jiun-Haw Chu

    • University of Washington

  • Ming Yi

    • Rice University
    • Rice Univ