Journal
PHYSICAL REVIEW B
Volume 97, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.201107
Keywords
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Funding
- Ministry of Science and Technology of China [2016YFA0300600, 2016YFA0401000, 2017YFA0302901]
- National Natural Science Foundation of China [11622435, 11474340, 11474330, 11774399]
- Chinese Academy of Sciences [XDB07000000, XDPB08-1, QYZDB-SSW-SLH043]
- Beijing Municipal Science and Technology Commission [Z171100002017018]
- NCCR Marvel
- Swiss National Supercomputing Centre (CSCS) [s832]
- CAS
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Topological nodal-line semimetals (TNLSMs) are characterized by symmetry-protected band crossings extending along one-dimensional lines in momentum space. The nodal lines exhibit a variety of possible configurations, such as nodal ring, nodal link, nodal chain, and nodal knot. Here, using angle-resolved photoemission spectroscopy, we observe nodal rings on the orthogonal k(z) = 0 and k(x) = 0 planes of the Brillouin zone in TiB2. The nodal rings connect with each other on the intersecting line Gamma-Kof the orthogonal planes forming a remarkable nodal-chain structure. Furthermore, we observe surface states (SSs) on the (001) cleaved surface, which are consistent with the calculated SSs considering the contribution from both Ti and B terminations. The calculated SSs have novel Dirac-cone-like band structures, which are distinct from the usual drumhead SSs with a single flatband proposed in other TNLSMs.
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