Universität zu Köln

Sato, Takafumi ORCID: 0000-0002-4544-5463, Wang, Zhiwei ORCID: 0000-0003-0182-2471, Nakayama, Kosuke, Souma, Seigo, Takane, Daichi, Nakata, Yuki, Iwasawa, Hideaki ORCID: 0000-0001-6760-4085, Cacho, Cephise ORCID: 0000-0002-0058-5817, Kim, Timur ORCID: 0000-0003-4201-4462, Takahashi, Takashi and Ando, Yoichi ORCID: 0000-0002-3553-3355 (2018). Observation of band crossings protected by nonsymmorphic symmetry in the layered ternary telluride Ta3SiTe6. Phys. Rev. B, 98 (12). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We have performed angle-resolved photoemission spectroscopy of the layered ternary telluride Ta3SiTe6 which is predicted to host nodal lines associated with nonsymmorphic crystal symmetry. We found that the energy bands in the valence-band region show Dirac-like dispersions which present a band degeneracy at the R point of the bulk orthorhombic Brillouin zone. This band degeneracy extends one dimensionally along the whole SR high-symmetry line, forming nodal lines protected by the glide mirror symmetry of the crystal. We also observed a small band splitting near E-F which supports the existence of hourglass-type dispersions predicted by the calculation. The present results provide an excellent opportunity to investigate the interplay between exotic nodal fermions and nonsymmorphic crystal symmetry.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Sato, Takafumi UNSPECIFIED orcid.org/0000-0002-4544-5463 UNSPECIFIED Wang, Zhiwei UNSPECIFIED orcid.org/0000-0003-0182-2471 UNSPECIFIED Nakayama, Kosuke UNSPECIFIED UNSPECIFIED UNSPECIFIED Souma, Seigo UNSPECIFIED UNSPECIFIED UNSPECIFIED Takane, Daichi UNSPECIFIED UNSPECIFIED UNSPECIFIED Nakata, Yuki UNSPECIFIED UNSPECIFIED UNSPECIFIED Iwasawa, Hideaki UNSPECIFIED orcid.org/0000-0001-6760-4085 UNSPECIFIED Cacho, Cephise UNSPECIFIED orcid.org/0000-0002-0058-5817 UNSPECIFIED Kim, Timur UNSPECIFIED orcid.org/0000-0003-4201-4462 UNSPECIFIED Takahashi, Takashi UNSPECIFIED UNSPECIFIED UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-172467
DOI:	10.1103/PhysRevB.98.121111
Journal or Publication Title:	Phys. Rev. B
Volume:	98
Number:	12
Date:	2018
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; DIRAC SEMIMETAL; MAGNETORESISTANCE; DISCOVERY; FERMIONS Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17246