Universität zu Köln

Takane, D., Wang, Zhiwei ORCID: 0000-0003-0182-2471, Souma, S., Nakayama, K., Trang, C. X., Sato, T., Takahashi, T. and Ando, Yoichi ORCID: 0000-0002-3553-3355 (2016). Dirac-node arc in the topological line-node semimetal HfSiS. Phys. Rev. B, 94 (12). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We have performed angle-resolved photoemission spectroscopy on HfSiS, which has been predicted to be a topological line-node semimetal with square Si lattice. We found a quasi-two-dimensional Fermi surface hosting bulk nodal lines, alongside the surface states at the Brillouin-zone corner exhibiting a sizable Rashba splitting and band-mass renormalization due to many-body interactions. Most notably, we discovered an unexpected Dirac-like dispersion extending one dimensionally in k space-the Dirac-node arc-near the bulk node at the zone diagonal. These novel Dirac states reside on the surface and could be related to hybridizations of bulk states, but currently we have no explanation for its origin. This discovery poses an intriguing challenge to the theoretical understanding of topological line-node semimetals.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Takane, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wang, Zhiwei UNSPECIFIED orcid.org/0000-0003-0182-2471 UNSPECIFIED Souma, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nakayama, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Trang, C. X. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sato, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Takahashi, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-262493
DOI:	10.1103/PhysRevB.94.121108
Journal or Publication Title:	Phys. Rev. B
Volume:	94
Number:	12
Date:	2016
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 WEYL FERMION SEMIMETAL; CRYSTALLINE INSULATOR; SURFACE; PHASE; TRANSITION; DISCOVERY; TAAS; SNTE Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26249