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Lorentz-violating type-II Dirac nodal line semimetals (DNLSs), hosting curvesof band degeneracy formed by two dispersion branches with the same sign ofslope, represent a novel states of matter. While being studied extensively intheory, convincing experimental evidences of type-II DNLSs remain elusive.Recently, Vanadium-based kagome materials have emerged as a fertile ground tostudy the interplay between lattice symmetry and band topology. In this work,we study the low-energy band structure of double-kagome-layeredCsV$_8$Sb$_{12}$ and identify it as a scarce type-II DNLS protected by mirrorsymmetry. We have observed multiple DNLs consisting of type-II Dirac conesclose to or almost at the Fermi level via angle-resolved photoemissionspectroscopy (ARPES). First-principle analyses show that spin-orbit couplingonly opens a small gap, resulting effectively gapless ARPES spectra, yetgenerating large spin Berry curvature. These type-II DNLs, together with theinteraction between a low-energy van Hove singularity and quasi-1D band as weobserved in the same material, suggest CsV$_8$Sb$_{12}$ as an ideal platformfor exploring novel transport properties such as chiral anomaly, the Kleintunneling and fractional quantum Hall effect.

Type-II Dirac Nodal Lines in double-kagome-layered CsV$_8$Sb$_{12}$