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

Fucong Fei; Xiangyan Bo; Pengdong Wang; Jianghua Ying; Jian Li; Ke Chen; Qing Dai; Bo Chen; Zhe Sun; Minhao Zhang; Fanming Qu; Yi Zhang; Qianghua Wang; Xuefeng Wang; Lu Cao; Haijun Bu; Fengqi Song; Xiangang Wan; Baigeng Wang

doi:10.1002/adma.201801556

Band Structure Perfection and Superconductivity in Type-II Dirac Semimetal Ir_1-_x Pt_x Te₂

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

Authors

Fucong Fei¹, Xiangyan Bo¹, Pengdong Wang², Jianghua Ying³, Jian Li⁴, Ke Chen⁵, Qing Dai⁵, Bo Chen¹, Zhe Sun², Minhao Zhang⁶, Fanming Qu³, Yi Zhang¹, Qianghua Wang¹, Xuefeng Wang⁶, Lu Cao¹, Haijun Bu¹, Fengqi Song¹, Xiangang Wan¹, Baigeng Wang¹

Affiliations

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.

PMID: 30019415
DOI: 10.1002/adma.201801556

Abstract

The discovery of a new type-II Dirac semimetal in Ir_1-_x Pt_x 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 Ir_1-_x Pt_x 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. Ir_1-_x Pt_x 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.

Abstract

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