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Ferromagnetic Weyl semimetals and their electromagnetic response in RAlX materials class (R= Ce or Pr and X = Si or Ge)

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Abstract

Ferromagnetic Weyl semimetals (FMWSMs) are exotic topological materials in which nontrivial band topology and magnetism drive novel electromagnetic responses such as the anomalous Hall effect (AHE). Currently available FMWSMs are limited to materials that preserve the inversion symmetry and generate the Weyl nodes by breaking the time-reversal symmetry (TRS). Here we present RAlX materials (R= Ce, Pr; X = Si, Ge) as new FMWSMs where the Weyl nodes are stabilized by breaking the inversion symmetry and their separation is controlled by breaking TRS. They show an unconventional AHE that can be tuned continuously by controlling the dispersion of the Weyl nodes. Based on our systematic first-principles calculations and transport measurements, we show that PrAlGe1-xSix (x = 0-1) is a type II FMWSM with an AHE that shows a transition from an intrinsic mechanism driven by the Berry curvature to an extrinsic scattering mechanism [1]. In contrast, CeAlSi is a noncollinear FMWSM with type I Weyl nodes [2]. It shows an AHE that appears (disappear) as the Fermi level is tuned to lie close to (away from) the Weyl nodes. Our study uncovers RAlX as a new, tunable FMWSM family hosting unconventional AHE.

1. H.-Y. Yang et al., APL Mater. 8, 011111 (2020).
2. H.-Y. Yang et al., arXiv: 2006.07943v2.

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Presenters

  • Cheng-Yi Huang

    Department of Physics, Northeastern University, Physics, Northeastern University, Physics, California State University, Northridge

Authors

  • Cheng-Yi Huang

    Department of Physics, Northeastern University, Physics, Northeastern University, Physics, California State University, Northridge

  • Bahadur Singh

    Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Department of Condensed Matter Physics and Material Science, Tata Institute of Fundamental Research, Tata Institute of Fundamental Research, Tata Institute for Fundamental Research, DCMPMS, Tata Institute of Fundamental Research, India, Condensed Matter Physics and Material Science, Tata Institute of Fundamental Research, Department of Condensed Matter Physics & Materials Science, Tata Institute of Fundamental Research

  • Hung-Yu Yang

    Department of Physics, Boston College, Boston College, Department of Physics, Boston College, Chestnut Hill, MA 02467, USA

  • Baozhu Lu

    Department of Physics and Temple Materials Institute, Temple University, Temple University

  • Faranak Bahrami

    Department of Physics, Boston College, Boston College

  • Jonathan Gaudet

    Department of Physics and Astronomy and Institute for Quantum Matter, The Johns Hopkins University, Johns Hopkins University, Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA

  • Bochao Xu

    Department of Physics, University of Connecticut, University of Connecticut, Physics Department, University of Connecticut

  • Jacob D Franklin

    Department of Physics, University of Connecticut, Physics Department, University of Connecticut, University of Connecticut

  • Ilya Sochnikov

    Institute of Material Science, University of Connecticut, Department of Physics, University of Connecticut

  • David E Graf

    National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Lab, Florida State University, National High Magnetic Field Laboratory, Tallahassee and Florida State University, National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Laboratory (FSU), Department of Physics, Florida State University, National High Magnetic Field Laboratory and Department of Physics, Florida State University, National High Magnetic Field Lab, National High Magnetic Field Laboratory, Tallahassee, FL, CMS, National High Magnetic Laboratory

  • Guangyong Xu

    NIST, NIST Center for Neutron Research, National Institute of Standards and Technology, National Institute of Standard and Technology, Center for Neutron Research, National Institute of Standards and Technology, National Institute of Standards and Technology, Center of Neutron Research, National Institute of Standards and Technology, NIST, NIST Center for Neutron Research, NIST

  • Yang Zhao

    NIST Center for Neutron Research,, National Institute of Standards and Technology, NIST Center for Neutron Research, National Institute of Standards and Technology, National Institute of Standard and Technology, Center for Neutron Research, National Institute of Standards and Technology, National Institute of Standards and Technology

  • Christina Hoffmann

    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge National Laboratory,

  • Collin Leslie Broholm

    Johns Hopkins University, Department of Physics and Astronomy and Institute for Quantum Matter, The Johns Hopkins University, Department of Physics and Astronomy and Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA, Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Physics, The Johns Hopkins University

  • Wei-Chi Chiu

    Department of Physics, Northeastern University

  • Shin-Ming Huang

    Department of Physics, National Sun Yat-sen University, National Sun Yat-Sen University

  • Baokai Wang

    Department of Physics, Northeastern University, Northeastern University, Department of Physics, Northeastern University, USA

  • Hsin Lin

    Institute of Physics, Academia Sinica, Academia Sinica, Institute of Physics, Academia Sinica, Taipei, Institute of Physics, Academia Sinica, Taiwan, Physics, Academia Sinica

  • Darius Torchinsky

    Department of Physics and Temple Materials Institute, Temple University, Temple University

  • Arun Bansil

    Department of Physics, Northeastern University, Northeastern University, NU, Department of Physics, Northeastern University, USA

  • Fazel Tafti

    Boston College, Department of Physics, Boston College, Department of Physics, Boston College, Chestnut Hill, MA 02467, USA