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- W3099350837 abstract "Abstract Topological nodal-line semimetals are characterized by line-contact bulk band crossings and topological surface states. Breaking certain protecting symmetry turns this system into a Dirac semimetal or Weyl semimetal that hosts zero-dimensional isolated nodal points. Recent advances in band theory predicted a topological nodal-line semimetal state possessing a new type of nodal line in AlB 2 -type diborides. Here, we report an experimental realization of nodal-line fermions and associated surface states near the Fermi energy in ZrB 2 by angle-resolved photoemission spectroscopy combined with first-principles calculations. The Dirac nodal lines in ZrB 2 wind into two groups of nodal rings, which are linked together along the Γ- K direction. We further observe a distinct surface state connecting to each nodal line, indicative of the nontrivial topological nature of the bulk nodal lines. Therefore, our results provide convincing experimental evidence of nodal-line semimetal states in ZrB 2 both in the bulk and on the surface, suggesting ZrB 2 as a remarkable platform for discovering unique phenomena induced by nodal-line fermions." @default.
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- W3099350837 date "2018-09-12" @default.
- W3099350837 modified "2023-10-11" @default.
- W3099350837 title "Experimental observation of bulk nodal lines and electronic surface states in ZrB2" @default.
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- W3099350837 doi "https://doi.org/10.1038/s41535-018-0121-4" @default.
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