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I05-ARPES	Observation of band crossings protected by nonsymmorphic symmetry in the layered ternary telluride Ta 3 SiTe 6 Takafumi Sato , Zhiwei Wang , Kosuke Nakayama , Seigo Souma , Daichi Takane , Yuki Nakata , Hideaki Iwasawa , Cephise Cacho , Timur Kim , Takashi Takahashi , Yoichi Ando Physical Review B 98, 121111 DOI: 10.1103/PhysRevB.98.121111 Diamond Proposal Number(s): [18839] Show Abstract ▼ 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 EF 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.	Sep 2018

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