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Unconventional Anomalous Hall Effect in a New Noncollinear Ferromagnetic Weyl Semimetal CeAlSi with Tunable Fermi Level

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Abstract

Ferromagnetic Weyl semimetals (FM WSMs) have drawn significant attention since they feature an interesting combination of magnetism and band topology. As a result, FM WSMs can host unique electromagnetic responses by bringing the Fermi level close to the Weyl nodes. Here, based on transport and quantum oscillation experiments aided by first-principles calculations, we show that CeAlSi is a new noncollinear FM WSM in which the Fermi level can be tuned to lie as close as 1 meV to the Weyl nodes [1]. Importantly, we observe an unconventional anomalous Hall effect (AHE) that appears (disappears) as the Fermi level lies close to (away from) the Weyl nodes. The close link between the novel AHE and the proximity of Weyl nodes to the Fermi level establishes a new transport response that is induced by the Weyl nodes in CeAlSi. We will discuss the role of topological surface states living on the ferromagnetic domain walls in generating the unusual electromagnetic response in CeAlSi.

[1] H.-Y. Yang et al., arXiv: 2006.07943v2.

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Presenters

  • Hung-Yu Yang

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

Authors

  • Hung-Yu Yang

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

  • Bahadur Singh

    DCMPMS, Tata Institute of Fundamental Research, Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Northeastern University, TIFR

  • 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

  • Baozhu Lu

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

  • Cheng-Yi Huang

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

  • 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

  • Faranak Bahrami

    Department of Physics, Boston College, Boston College

  • 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

  • Christina Hoffmann

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

  • 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

  • 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

  • Arun Kumar Bansil

    Department of Physics, Northeastern University, Northeastern University, Northeastern U

  • Fazel Tafti

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