Observation of band crossings protected by nonsymmorphic symmetry in the layered ternary telluride Ta3SiTe6

Takafumi Sato, Zhiwei Wang, Kosuke Nakayama, Seigo Souma, Daichi Takane, Yuki Nakata, Hideaki Iwasawa, Cephise Cacho, Timur Kim, Takashi Takahashi, Yoichi Ando

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We have performed angle-resolved photoemission spectroscopy of the layered ternary telluride Ta3SiTe6 which is predicted to host nodal lines associated with nonsymmorphic crystal symmetry. We found that the energy bands in the valence-band region show Dirac-like dispersions which present a band degeneracy at the R point of the bulk orthorhombic Brillouin zone. This band degeneracy extends one dimensionally along the whole SR high-symmetry line, forming nodal lines protected by the glide mirror symmetry of the crystal. We also observed a small band splitting near EF which supports the existence of hourglass-type dispersions predicted by the calculation. The present results provide an excellent opportunity to investigate the interplay between exotic nodal fermions and nonsymmorphic crystal symmetry.

Original languageEnglish
Article number121111
JournalPhysical Review B
Volume98
Issue number12
DOIs
Publication statusPublished - 2018 Sep 26

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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