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Observation of Fermi arcs and Weyl nodes in a non-centrosymmetric magnetic Weyl semimetal.

POSTER

Abstract

Weyl semimetals (WSMs) host Weyl fermions as emergent quasiparticles resulting from the breaking of either inversion or time-reversal symmetry. Magnetic WSMs that arise from broken time-reversal symmetry provide exceptional platform to understand the interplay between magnetic order and Weyl physics, but only a few such WSMs have been realized experimentally. Here, we identify CeAlSi as a new non-centrosymmetric magnetic WSM via angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations. Surface-sensitive vacuum ultraviolet ARPES data confirms the presence of surface Fermi arcs as the smoking gun evidence for the existence of the Weyl semi metallic state. We also observe bulk Weyl cones in CeAlSi using bulk-sensitive soft-X-ray ARPES measurements. In addition, Ce 4f bands are found near the Fermi level, indicating that CeAlSi is a unique platform for investigating exotic quantum phenomena resulting from the interaction of topology, magnetism, and electronic correlations.

Presenters

  • Mazharul Islam Mondal

    University of Central Florida

Authors

  • Mazharul Islam Mondal

    University of Central Florida

  • Anup Pradhan Sakhya

    University of Central Florida

  • Cheng-Yi Huang

    Northeastern University

  • Gyanendra Dhakal

    University of Central Florida

  • Xuejian Gao

    Department of Physics, Hong Kong University of Science and Technology, Hong Kong, China, The Hong Kong University of Science and Technology

  • Sabin Regmi

    University of Central Florida, University of Central Florida; Idaho National Laboratory

  • Baokai Wang

    Northeastern University

  • Wei Wen

    Department of Physics, Westlake University, Hangzhou, Zhejiang 310024, China, Key Laboratory for Quantum Materials of Zhejiang Province

  • Wei Wen

    Department of Physics, Westlake University, Hangzhou, Zhejiang 310024, China, Key Laboratory for Quantum Materials of Zhejiang Province

  • Xiaohan Yao

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

  • Robert Smith

    University of Central Florida

  • Milo X Sprague

    University of Central Florida

  • Shunye Gao

    Beijing National Laboratory for condensed matter physic and institute of physics, Chinese Academy of sciences, Beijing, China

  • Bahadur Singh

    Tata Institute of Fundamental Research, Mumbai, India, Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Colaba, Mumbai 400005, India, Department of condensed matter physics and material science, Tata institute of fundamental research, Mumbai, India, Tata Institute of Fundamental Research, India, Tata Institute of Fundamental Research

  • Hsin Lin

    Academia Sinica

  • Suyang Xu

    Harvard University

  • Fazel Tafti

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

  • Arun Bansil

    Northeastern University, Northeastern University, Boston, USA

  • Madhab Neupane

    University of Central Florida