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Observation of band crossings protected by nonsymmorphic symmetry in the layered ternary telluride Ta 3 SiTe 6

DOI: 10.1103/PhysRevB.98.121111 DOI Help

Authors: Takafumi Sato (Tohoku University) , Zhiwei Wang (University of Cologne) , Kosuke Nakayama (Tohoku University) , Seigo Souma (Tohoku University) , Daichi Takane (Tohoku University) , Yuki Nakata (Tohoku University) , Hideaki Iwasawa (Diamond Light Source) , Cephise Cacho (Diamond Light Source) , Timur Kim (Diamond Light Source) , Takashi Takahashi (Tohoku University) , Yoichi Ando (University of Cologne)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 98 , PAGES 121111

State: Published (Approved)
Published: September 2018
Diamond Proposal Number(s): 18839

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.

Subject Areas: Physics, Materials


Instruments: I05-ARPES

Other Facilities: Photon Factory, KEK, Japan