Band Structure Perfection and Superconductivity in Type-II Dirac Semimetal Ir1−xPtxTe2

The discovery of a new type-II Dirac semimetal in Ir 1− x Pt x Te 2 with optimized band structure is described. Pt dopants protect the crystal structure holding the Dirac cones and tune the Fermi level close to the Dirac point. The type-II Dirac dispersion in Ir 1− x Pt x Te 2 is confirmed by angle-resolved photoemission spectroscopy and first-principles calculations. Superconductivity is also observed and persists when the Fermi level aligns with the Dirac points. Ir 1− x Pt x Te 2 is an ideal platform for further studies on the exotic properties and potential applications of type-II DSMs, and opens up a new route for the investigation of the possible topological superconductivity and Majorana physics.