Lorentz-violating type-II Dirac fermions in transition metal dichalcogenide PtTe₂.

ABSTRACT: Topological semimetals have recently attracted extensive research interests as host materials to condensed matter physics counterparts of Dirac and Weyl fermions originally proposed in high energy physics. Although Lorentz invariance is required in high energy physics, it is not necessarily obeyed in condensed matter physics, and thus Lorentz-violating type-II Weyl/Dirac fermions could be realized in topological semimetals. The recent realization of type-II Weyl fermions raises the question whether their spin-degenerate counterpart-type-II Dirac fermions-can be experimentally realized too. Here, we report the experimental evidence of type-II Dirac fermions in bulk stoichiometric PtTe₂ single crystal. Angle-resolved photoemission spectroscopy measurements and first-principles cal

SUBMITTER: Yan M 

PROVIDER: S-EPMC5557853 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature