Evidence for bulk nodal loops and universality of Dirac-node arc surface states in ZrGeXc (Xc=S, Se, Te)

Takechika Nakamura, Seigo Souma, Zhiwei Wang, Kunihiko Yamauchi, Daichi Takane, Hikaru Oinuma, Kosuke Nakayama, Koji Horiba, Hiroshi Kumigashira, Tamio Oguchi, Takashi Takahashi, Yoichi Ando, Takafumi Sato

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


We have performed angle-resolved photoemission spectroscopy (ARPES) on layered ternary compounds ZrGeXc (Xc=S, Se, and Te) with square Ge lattices. ARPES measurements with bulk-sensitive soft-x-ray photons revealed a quasi-two-dimensional bulk-band structure with the bulk nodal loops protected by glide mirror symmetry of the crystal lattice. Moreover, high-resolution ARPES measurements near the Fermi level with vacuum-ultraviolet photons combined with first-principles band-structure calculations elucidated a Dirac-node-arc surface state traversing a tiny spin-orbit gap associated with the nodal loops. We found that this surface state commonly exists in ZrGeXc despite the difference in the shape of nodal loops. The present results suggest that the spin-orbit coupling and the multiple nodal loops cooperatively play a key role in creating the exotic Dirac-node-arc surface states in this class of topological line-node semimetals.

Original languageEnglish
Article number245105
JournalPhysical Review B
Issue number24
Publication statusPublished - 2019 Jun 4

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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