Nontrivial Berry phase and type-II Dirac transport in the layered material PdTe2

We report on a systematic study of type-II Dirac fermions in a layered crystal of PdTe2. De Haas-van Alphen oscillations show a small Fermi-surface pocket with a cross section of 0.077 nm(-2) with a nontrivial Berry phase. First-principles calculation reveals that the nontrivial Berry phase originates from a hole pocket formed by the tilted Dirac cone. In addition, the band dispersion measured with angle-resolved photoemission spectroscopy is found to be consistent with that of a type-II Dirac cone dispersion. We propose that PdTe2 is an improved platform to host topological superconductors.