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We have performed angle-resolved photoemission spectroscopy of layeredternary telluride Ta3SiTe6 which is predicted to host nodal lines associatedwith nonsymmorphic crystal symmetry. We found that the energy bands in thevalence-band region show Dirac-like dispersions which present a band degeneracyat the R point of the bulk orthorhombic Brillouin zone. This band degeneracyextends one-dimensionally along the whole SR high-symmetry line, forming thenodal lines protected by the glide mirror symmetry of the crystal. We alsoobserved a small band splitting near EF which supports the existence ofhourglass-type dispersions predicted by the calculation. The present resultsprovide an excellent opportunity to investigate the interplay between exoticnodal fermions and nonsymmorphic crystal symmetry.

Observation of band crossings protected by nonsymmorphic symmetry in the layered ternary telluride Ta3SiTe6