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Weyl-node-driven domain wall motion and collective magnetism in double-symmetry-breaking Weyl semimetals

ORAL · Invited

Abstract

In the RAlX (R = rare-earths, X = Ge/Si) material family where both inversion and time-reversal symmetry are broken, not only the magnetic Weyl nodes are stabilized, but also interesting interactions are enabled and can lead to new Weyl physics [1-8]. The abundance of robust magnetic Weyl semimetals in the RAlX family allows for domain wall motion and collective magnetism related to Weyl nodes to emerge. We give an overview of rich domain wall physics in different RAlX materials revealed by scanning SQUID microscopy [3, 4], magneto-optical Kerr effect [5], and small-angle neutron scattering [6], and Weyl-mediated magnetism detected by neutron diffraction [6, 7]. In particular, we highlight the unusual electrical transport driven by domain walls and Weyl nodes [6, 8], and collective magnetism driven by Weyl-mediated interactions [7]. We demonstrate that the double-symmetry-breaking RAlX family is a promising avenue for new Weyl physics.

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Publication: [1] G. Chang et al., Phys. Rev. B 97, 041104 (2018)<br>[2] H.-Y. Yang, B. Singh, B. Lu et al., APL Materials 8, 011111 (2020)<br>[3] B. Xu et al., Adv. Quantum Technol. 2000101 (2021)<br>[4] B. Xu et al., arXiv:2105.14384 (2021)<br>[5] Y. Sun et al., arXiv:2104.07706 (2021)<br>[6] H.-Y. Yang, J. Gaudet et al., in preparation<br>[7] J. Gaudet, H.-Y. Yang, S. Baidya et al., Nat. Mater. (2021)<br>[8] ​​H.-Y. Yang, B. Singh, J. Gaudet, et al., Phys. Rev. B 103, 115134 (2021) (Editor's Suggestion)

Presenters

  • Hung-Yu Yang

    Boston College

Authors

  • Hung-Yu Yang

    Boston College

  • Fazel Tafti

    Boston College

  • Bahadur Singh

    Tata Institute of Fundamental Research, Tata Institute for Fundamental Research, TIFR, Tata Institute of Fundamental Research, Mumbai, Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai, India

  • Arun Bansil

    Northeastern University, Department of Physics, Northeastern University, USA

  • Jonathan Gaudet

    National Institute of Standards and Technology, Johns Hopkins University

  • Collin L Broholm

    Johns Hopkins University, John Hopkins University

  • Santu Baidya

    Rutgers University, New Brunswick

  • David Vanderbilt

    Rutgers University, Rutgers University, New Brunswick

  • Predrag Nikolic

    George Mason University

  • Baozhu Lu

    Temple University

  • Darius H Torchinsky

    Temple University

  • Cheng-Yi Huang

    Northeastern University

  • Hsin Lin

    Academia Sinica, Institute of Physics, Academia Sinica, Taiwan

  • Bochao Xu

    University of Connecticut

  • Ilya Sochnikov

    University of Connecticut

  • David E Graf

    Florida State University, National High Magnetic Field Laboratory, NHMFL, Florida State University, National High Magnetic Field Laboratory and Department of Physics, Florida State University