Evidence for bulk nodal loops and universality of Dirac-node arc surface states in ZrGeXc (Xc = S, Se, Te)

Abstract

We have performed angle-resolved photoemission spectroscopy (ARPES) on layered ternary compounds ZrGeXc (Xc = S, Se, and Te) with square Ge lattices. ARPES measurements with bulk-sensitive soft-x-ray photons revealed a quasi-two-dimensional bulk-band structure with the bulk nodal loops protected by glide mirror symmetry of the crystal lattice. Moreover, high-resolution ARPES measurements near the Fermi level with vacuum-ultraviolet photons combined with first-principles band-structure calculations elucidated a Dirac-node-arc surface state traversing a tiny spin-orbit gap associated with the nodal loops. We found that this surface state commonly exists in ZrGeXc despite the difference in the shape of nodal loops. The present results suggest that the spin-orbit coupling and the multiple nodal loops cooperatively play a key role in creating the exotic Dirac-node-arc surface states in this class of topological line-node semimetals.

arXiv comment11 pages, 9 figures

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• Tunable large spin Hall and spin Nernst effects in Dirac semimetals ZrXY (X=Si, Ge; Y=S, Se, Te)
• Light-induced renormalization of the Dirac quasiparticles in the nodal-line semimetal ZrSiSe
• Modular Arithmetic with Nodal Lines: Drumhead Surface States in ZrSiTe
• Extremely large magnetoresistance from electron-hole compensation in the nodal loop semimetal ZrP${}_2$
• Semi-Dirac Fermions in a Topological Metal
• Disorder driven multifractality transition in Weyl nodal loops
• Symmetry-selective quasiparticle scattering and electric field tunability of the ZrSiS surface electronic structure
• Anisotropic non-linear optical response of nodal loop materials
• Quasiparticle interference observation of the topologically non-trivial drumhead surface state in ZrSiTe
• Dirac Nodal Line and Rashba Splitting Surface States in Nonsymmorphic ZrGeTe
• Revealing a charge-density-wave gap in the predicted weak topological insulator HoSbTe
• Delocalization of topological surface states by diagonal disorder in nodal loop semimetals
• Emergent impervious band crossing in the bulk in topological nodal line semimetal ZrAs${}_2$
• Electronic properties of graphyne-$N$ monolayer and its multilayer: even-odd effect and topological nodal line semimetalic phases
• Intrinsic defect intolerance in the ultra-pure metal PtSn${}_4$
• Dirac Dispersions and Fermi Surface Nesting in LaCuSb${}_2$