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

Abstract

We have performed angle-resolved photoemission spectroscopy of 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 the 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.

arXiv comment6 pages, 4 figures

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• Directional massless Dirac fermions in a layered van der Waals material with one-dimensional long-range order
• Berry curvature dipole and nonlinear Hall effect in two-dimensional Nb${}_{2n+1}$Si${}_n$Te${}_{4n+2}$
• Inherited Weak Topological Insulator Signatures in Topological Hourglass Semimetal Nb3XTe6 (X = Si, Ge)
• Spectroscopic Evidence for Dirac Nodal Surfaces and Nodal Rings in Superconductor NaAlSi
• Plasmons in a two-dimensional nonsymmorphic nodal-line semimetal
• Signature of topological non-trivial band structure in Ta${}_3$SiTe${}_6$
• Effects of spatial dimensionality and band tilting on the longitudinal optical conductivities in Dirac bands
• Signatures of van Hove singularities in the anisotropic in-plane optical conductivity of the topological semimetal Nb${}_3$SiTe${}_6$
• Impurity-induced resonant states in topological nodal-line semimetals
• Coexistence of Chiral Majorana Edge States and Bogoliubov Fermi Surfaces in Two-Dimensional Nonsymmorphic Dirac Semimetal/Superconductor Heterostructures
• Nonlinear Optical Spectroscopy of Nodal-Line Semimetals
• Spectroscopic Evidence on Realization of a Genuine Topological Nodal Line Semimetal in LaSbTe
• Topological semimetal phases in a family of monolayer X3YZ6 (X=Nb,Ta, Y=Si,Ge,Sn, Z=S,Se,Te) with abundant nodal lines and nodes
• Nodal-line semimetal superlattices