Nakamura, Takechika, Souma, Seigo, Wang, Zhiwei ORCID: 0000-0003-0182-2471, Yamauchi, Kunihiko ORCID: 0000-0002-9265-1091, Takane, Daichi, Oinuma, Hikaru, Nakayama, Kosuke, Horiba, Koji ORCID: 0000-0002-1124-0451, Kumigashira, Hiroshi, Oguchi, Tamio, Takahashi, Takashi, Ando, Yoichi ORCID: 0000-0002-3553-3355 and Sato, Takafumi ORCID: 0000-0002-4544-5463 (2019). Evidence for bulk nodal loops and universality of Dirac-node arc surface states in ZrGeXc (X-c = S, Se, Te). Phys. Rev. B, 99 (24). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We have performed angle-resolved photoemission spectroscopy (ARPES) on layered ternary compounds ZrGeXc (X-c = 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 Diracnode-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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Nakamura, TakechikaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Souma, SeigoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wang, ZhiweiUNSPECIFIEDorcid.org/0000-0003-0182-2471UNSPECIFIED
Yamauchi, KunihikoUNSPECIFIEDorcid.org/0000-0002-9265-1091UNSPECIFIED
Takane, DaichiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Oinuma, HikaruUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nakayama, KosukeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Horiba, KojiUNSPECIFIEDorcid.org/0000-0002-1124-0451UNSPECIFIED
Kumigashira, HiroshiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Oguchi, TamioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Takahashi, TakashiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ando, YoichiUNSPECIFIEDorcid.org/0000-0002-3553-3355UNSPECIFIED
Sato, TakafumiUNSPECIFIEDorcid.org/0000-0002-4544-5463UNSPECIFIED
URN: urn:nbn:de:hbz:38-138154
DOI: 10.1103/PhysRevB.99.245105
Journal or Publication Title: Phys. Rev. B
Volume: 99
Number: 24
Date: 2019
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
TOPOLOGICAL CRYSTALLINE INSULATOR; SEMIMETALMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/13815

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