Discovery of Lorentz-violating type-II Weyl fermions in LaAlGe

ORAL

Abstract

Recently, a few crystal candidates were predicted to be type-II Weyl semimetals, but have yet to be conclusively confirmed with conventional ARPES techniques. Here we present the first direct experimental observation of a type-II Weyl semimetal in LaAlGe by using ARPES to resolve its type-II Weyl nodes and cones. Unlike the previously proposed type-II Weyl semimetals, the type-II Weyl nodes in LaAlGe are observed to be located at the Fermi level and, therefore, dominate the low-energy physics.

*Work at Princeton University and Princeton-led synchrotron-based ARPES measurements is supported by the U.S. Department of Energy under Basic Energy Sciences Grant No. DOE/BES DE-FG-02-05ER46200.

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Authors

  • Daniel S. Sanchez

    • Princeton University

  • Su-Yang Xu

    • Princeton University

  • Nasser Alidoust

    • Princeton University

  • Guoqing Chang

    • Research Centre National University of Singapore

  • Hong Lu

    • Peking University

  • Bahadur Singh

    • Research Centre National University of Singapore

  • Ilya Belopolski

    • Princeton University

  • Xiao Zhang

    • Peking University

  • Guang Bian

    • Princeton University

  • Hao Zheng

    • Princeton University

  • Marius-Adrian Husanu

    • Paul Scherrer Institute

  • Yi Bian

    • Peking University

  • Shin-Ming Huang

    • Research Centre National University of Singapore

  • Chuang-Han Hsu

    • Research Centre National University of Singapore

  • Tay-Rong Chang

    • National Tsing Hua University

  • Horng-Tay Jeng

    • National Tsing Hua University

  • Arun Bansil

    • Northeastern University

  • Titus Neupert

    • Princeton University

  • Vladimir N. Strocov

    • Paul Scherrer Institute

  • Hsin Lin

    • Research Centre National University of Singapore

  • Shuang Jia

    • Peking University

  • M. Zahid Hasan

    • Princeton University