Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Nakamura, Takechika UNSPECIFIED UNSPECIFIED UNSPECIFIED Souma, Seigo UNSPECIFIED UNSPECIFIED UNSPECIFIED Wang, Zhiwei UNSPECIFIED orcid.org/0000-0003-0182-2471 UNSPECIFIED Yamauchi, Kunihiko UNSPECIFIED orcid.org/0000-0002-9265-1091 UNSPECIFIED Takane, Daichi UNSPECIFIED UNSPECIFIED UNSPECIFIED Oinuma, Hikaru UNSPECIFIED UNSPECIFIED UNSPECIFIED Nakayama, Kosuke UNSPECIFIED UNSPECIFIED UNSPECIFIED Horiba, Koji UNSPECIFIED orcid.org/0000-0002-1124-0451 UNSPECIFIED Kumigashira, Hiroshi UNSPECIFIED UNSPECIFIED UNSPECIFIED Oguchi, Tamio UNSPECIFIED UNSPECIFIED UNSPECIFIED Takahashi, Takashi UNSPECIFIED UNSPECIFIED UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED Sato, Takafumi UNSPECIFIED orcid.org/0000-0002-4544-5463 UNSPECIFIED
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:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TOPOLOGICAL CRYSTALLINE INSULATOR; SEMIMETAL Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13815