Dirac Nodal Line in Hourglass Semimetal Nb3SiTe6

Ro Ya Liu, Angus Huang, Raman Sankar, Joseph Andrew Hlevyack, Chih Chuan Su, Shih Chang Weng, Meng Kai Lin, Peng Chen, Cheng Maw Cheng, Jonathan D. Denlinger, Sung Kwan Mo, Alexei V. Fedorov, Chia Seng Chang, Horng Tay Jeng, Tien Ming Chuang, Tai Chang Chiang

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Glide-mirror symmetry in nonsymmorphic crystals can foster the emergence of novel hourglass nodal loop states. Here, we present spectroscopic signatures from angle-resolved photoemission of a predicted topological hourglass semimetal phase in Nb3SiTe6. Linear band crossings are observed at the zone boundary of Nb3SiTe6, which could be the origin of the nontrivial Berry phase and are consistent with a predicted glide quantum spin Hall effect; such linear band crossings connect to form a nodal loop. Furthermore, the saddle-like Fermi surface of Nb3SiTe6observed in our results helps unveil linear band crossings that could be missed. In situ alkali-metal doping of Nb3SiTe6also facilitated the observation of other band crossings and parabolic bands at the zone center correlated with accidental nodal loop states.

Original languageEnglish
Pages (from-to)380-388
Number of pages9
JournalNano Letters
Volume23
Issue number1
DOIs
StatePublished - 11 Jan 2023

Keywords

  • Dirac nodal loop
  • first-principles band structures
  • glide-mirror symmetry
  • hourglass fermions
  • nonsymmorphic crystals
  • photoemission

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