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PtTe$_2$ and PdTe$_2$ are among the first transition metal dichalcogenidesthat were predicted to host type-II Dirac fermions, exotic particles prohibitedin free space. These materials are layered and air-stable, which makes them topcandidates for technological applications that take advantage of theiranisotropic magnetotransport properties. Here, we provide a detailedcharacterization of the electronic structure of PtTe$_2$ and PdTe$_2$ usingAngle Resolved Photoemission Spectroscopy ARPES and Density Functional TheoryDFT calculations, unveiling a new three-dimensional Dirac-like dispersion inthese materials. Through the use of circularly polarized light, we report adifferent behavior of such dispersion in PdTe$_2$ compared to PtTe$_2$, that werelate to our DFT calculations. Additionally, our circular dichroism data showsa sharp difference between the known type-II Dirac cones and the topologicallyprotected surface states in these materials. Finally, we present an analysisthat links our experimental and theoretical data to the different symmetriesassociated to the crystallographic space group shared by PtTe$_2$ and PdTe$_2$.Our work provides a useful reference for the ARPES characterization of othertransition metal dichalcogenides with topological properties and illustratesthe use of circular dichroism as an additional tool to differentiate thetopological character of two otherwise equivalent band dispersions and toidentify new dispersions.

Observation of a new three-dimensional Dirac-like dispersion in the type-II Dirac semimetals PtTe2 and PdTe2