Observation of a Dirac nodal loop in the non-symmorphic semimetal Nb<sub>3</sub>SiTe<sub>6</sub>

ORAL

Abstract

In 3-dimensional non-symmorphic crystals, band crossings protected by translational symmetry can host Dirac nodal loops in a 2-dimensional cut in the momentum surface. These nodal loops, often with an hourglass shape, give rise to unusual bulk and surface properties, including anisotropic electronic transport and chiral anomaly, based on transport or optical response measurements. This talk will present a detailed study of the band structure of Nb3SiTe6 by angle-resolved photoemission spectroscopy. The dispersion relations along the XS direction, which is perpendicular to the sample surface, is mapped out by varying the incident photon energy. The results show that the crossing point (Dirac point) of a Dirac cone at gradually shifts to higher binding in going from X to S. The measurements provide evidence for the presence of a Dirac nodal loop in this system.

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Presenters

  • Ro-Ya Liu

    • Department of Physics, University of Illinois at Urbana-Champaign
    • University of Illinois at Urbana-Champaign

Authors

  • Ro-Ya Liu

    • Department of Physics, University of Illinois at Urbana-Champaign
    • University of Illinois at Urbana-Champaign

  • Angus Huang

    • Department of Physics, National Tsing Hua University

  • Chih-Chuan Su

    • Institute of Physics, Academia Sinica

  • Raman Sankar

    • Institute of Physics, Academia Sinica
    • National Taiwan University
    • Academia Sinica

  • Shih-Chang Weng

    • National Synchrotron Radiation Research Center

  • Meng-Kai Lin

    • Department of Physics, University of Illinois at Urbana-Champaign
    • University of Illinois at Urbana-Champaign

  • Peng Chen

    • School of Physics and Astronomy, Shanghai Jiao Tong University
    • University of Illinois at Urbana-Champaign

  • Joseph Hlevyack

    • Department of Physics, University of Illinois at Urbana-Champaign
    • University of Illinois at Urbana-Champaign

  • Alexei V Fedorov

    • Advanced Light Source, Lawrence Berkeley National Lab
    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Cheng-Maw Cheng

    • National Synchrotron Radiation Research Center
    • National Synchrotron Radiation Research Center, Hsinchu, Taiwan
    • Natl Synchrotron Rad Res Ctr

  • Jonathan Denlinger

    • Lawrence Berkeley National Laboratory
    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • Advanced Light Source, Lawrence Berkeley National Lab
    • Advanced Light Source
    • Advanced Light Source, E. O. Lawrence Berkeley National Laboratory

  • Chia-Seng Chang

    • Institute of Physics, Academia Sinica

  • Horng-Tay Jeng

    • Department of Physics, National Tsing Hua University

  • Tien-Ming Chuang

    • Institute of Physics, Academia Sinica

  • Tai-Chang Chiang

    • Department of Physics, University of Illinois at Urbana-Champaign
    • University of Illinois at Urbana-Champaign