Magnetic excitations and electronic structure of Kagome metal FeGe

ORAL

Abstract

Two-dimensional (2D) layered Kagome compounds are great platforms to study not only magnetic frustration but also topological phases that realize flat bands. It is predicted that the Kagome lattice can be constructed to realize flat band physics at 1/3 filling and quantum anomalous Hall effect mainly at 2/3 filling. Recently, a family of Kagome metals TmXn (T: Fe, Co, X: Sn,Ge, m:n = 3:1, 3:2, 1:1) has attracted much interests. Although flat bands and Dirac crossings are expected in the single-orbital nearest-neighbor Kagome model, possible complications from evolution of the magnetic order and strong electron-electron interactions remain largely unexplored experimentally. Here I will present a new Kagome system - FeGe. Distinct from widely studied planar antiferromagnetic (AFM) FeSn (TN = 365 K) and paramagnetic CoSn, it has a collinear c-axis antiferromagnetic (AFM) structure between T­­N = 410 K and T1 ~ 60 K, followed by an AFM spiral structure below T1 ~ 60 K.

In this talk, I will focus on systematic studies of the magnetic excitations and electronic structures via neutron scattering and angle-resolved photoemission spectroscopy measurements, which reveal this system to be an exciting new platform for studying correlation and magnetism in the presence of topology.

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Presenters

  • Xiaokun Teng

    • Rice University

Authors

  • Xiaokun Teng

    • Rice University

  • Ji Seop Oh

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

  • Ming Yi

    • Rice University
    • Rice Univ

  • Pengcheng Dai

    • Rice Univ
    • Rice University

  • Jianxin Zhu

    • Los Alamos Natl Lab
    • Los Alamos National Laboratory

  • Kelly Neubauer

    • Rice Univ

  • Lebing Chen

    • Rice University

  • Bin Gao

    • Rice University

  • Feng Ye

    • Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • Garrett E Granroth

    • Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • Aaron Bostwick

    • Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Lab
    • E. O. Lawrence Berkeley National Laboratory
    • lawrence berkeley lab
    • Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley

  • Eli Rotenberg

    • Lawrence Berkeley National Laboratory

  • Christopher Jozwiak

    • Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Lab
    • E. O. Lawrence Berkeley National Laboratory
    • lawrence berkeley lab
    • Advanced Light Source, 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

  • Robert J Birgeneau

    • University of California, Berkeley