Neutron scattering study on a topological antiferromagnet

ORAL

Abstract

As analogue of Dirac fermions in topological semimetals, magnon Dirac points have recently been proposed [1] and observed [2,3] in a three-dimensional antiferromagnet, Cu3TeO6. Motivated by the expected presence of Dzyaloshinskii-Moriya interactions in this system [1], we have performed a detailed magnetic neutron diffraction measurement on a single crystal, aiming to detect possible non-collinear spin arrangements in the magnetically ordered state. The result in turn allows for an estimate of the sizes of the topological nodal lines that are represented by the Dirac points in the U(1)-symmetric approximation. Furthermore, we have attempted the first inelastic neutron scattering experiment in search of the putative topological magnon surface states [1,2].

[1] Li et al., Phys. Rev. Lett. 119, 247202 (2017).
[2] Yao et al., Nat. Phys. 14, 1011 (2018).
[3] Bao et al., Nat. Commun. 9, 2591 (2018).

–

Presenters

  • Weiliang Yao

    Internationan Center for Quantum Materials, Peking University, Peking University

Authors

  • Weiliang Yao

    Internationan Center for Quantum Materials, Peking University, Peking University

  • Yangmu Li

    Brookhaven National Laboratory, CMPMS, Brookhaven National Laboratory, Condensed Matter Physics & Materials Science, Brookhaven National Laboratory

  • Kazuki Iida

    Comprehensive Research Organization for Science and Society, Japan, Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society

  • Takashi Ohhara

    Japan Atomic Energy Research Agency

  • Akiko Nakao

    Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS)

  • Barry L. Winn

    Oak Ridge National Laboratory, Neutron Science Directorate, Oak Ridge National Laboratory, Oak Ridge National Lab

  • John Tranquada

    Brookhaven National Laboratory, CMPMS, Brookhaven National Laboratory, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Condensed Matter Physics & Materials Science, Brookhaven National Laboratory, Brookhaven Natl Lab

  • Igor Zaliznyak

    Brookhaven National Laboratory, CMPMS, Brookhaven National Laboratory

  • Chenyuan Li

    Internationan Center for Quantum Materials, Peking University, Peking University

  • Chen Fang

    Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China, Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China, Institute of physics, Chinese Academy of Sciences

  • Yuan Li

    Internationan Center for Quantum Materials, Peking University, Peking University, International Center for Quantum Materials, Peking University, School of Physics, Peking University