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Adv Mater. 2018 Aug;30(35):e1801556. doi: 10.1002/adma.201801556. Epub 2018 Jul 17.

Band Structure Perfection and Superconductivity in Type-II Dirac Semimetal Ir1-x Ptx Te2.

Author information

1
National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Department of Physics, Nanjing University, Nanjing, 210093, China.
2
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029, China.
3
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
4
Westlake Institute for Advanced Study, Hangzhou, 310012, China.
5
Nanophotonics Research Division, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China.
6
National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.

Abstract

The discovery of a new type-II Dirac semimetal in Ir1-x Ptx Te2 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 Ir1-x Ptx Te2 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. Ir1-x Ptx Te2 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.

KEYWORDS:

ARPES; Dirac semimetals; superconductors; topological materials; type-II

PMID:
30019415
DOI:
10.1002/adma.201801556

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