Band structure of ZrTe$_5$ measured by high-momentum-resolution photoemission spectroscopy

ORAL

Abstract

We have performed a systematic high-momentum-resolution photoemission study on ZrTe$_5$ using a photon energy of $6$ eV. We have measured the band structure near $\Gamma$, and quantified the gap between conduction and valence band as $25\pm5$ meV. We have also observed photon-energy-dependent spectral changes, and attributed these changes to final-state effects and the 3D nature of the material's band structure. Our observation suggests that ZrTe$_5$ is neither a 3D strong topological insulator, nor a Dirac semimetal. We further propose a model which promises to reconcile discrepancies on the existence of surface state in different literature studies of this material.

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Authors

  • Hongyu Xiong

    • Stanford University, SLAC National Accelerator Laboratory

  • Jonathan Sobota

    • Stanford University, SLAC National Accelerator Laboratory, Lawrence Berkeley National Laboratory

  • Shuolong Yang

    • Stanford University, SLAC National Accelerator Laboratory

  • Hadas Soifer

    • SLAC National Accelerator Laboratory

  • Alexandre Gauthier

    • Stanford University, SLAC National Accelerator Laboratory

  • Ming-Hui Lu

    • Nanjing University

  • Yang-Yang Lv

    • Nanjing University

  • Shuhua Yao

    • Nanjing University

  • Donghui Lu

    • SLAC National Accelerator Laboratory

  • Makoto Hashimoto

    • SLAC National Accelerator Laboratory

  • Patrick Kirchmann

    • SLAC National Accelerator Laboratory

  • Yan-Feng Chen

    • Nanjing University

  • Zhi-Xun Shen

    • Stanford University, SLAC National Accelerator Laboratory