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Realization of low-energy type-II Dirac fermions in (Ir 1− x Pt x )Te 2 superconductors

DOI: 10.1088/1674-1056/28/3/037103 DOI Help

Authors: Bin-bin Fu (Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences; University of Chinese Academy of Sciences) , Chang-jiang Yi (Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences; University of Chinese Academy of Sciences) , Zhi-jun Wang (Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences) , Meng Yang (Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences; University of Chinese Academy of Sciences) , Bai-qing Lv (Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences; University of Chinese Academy of Sciences) , Xin Gao (Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences; University of Chinese Academy of Sciences) , Man Li (Shanghai Synchrotron Radiation Facility; Renmin University of China) , Yao-bo Huang (Shanghai Synchrotron Radiation Facility) , Hong-ming Weng (Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences; Songshan Lake Materials Laboratory) , You-guo Shi (Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences; Songshan Lake Materials Laboratory) , Tian Qian (Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences; Songshan Lake Materials Laboratory; University of Chinese Academy of Sciences) , Hong Ding (Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences; University of Chinese Academy of Sciences)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chinese Physics B , VOL 28

State: Published (Approved)
Published: March 2019

Abstract: Topological Dirac semimetals (DSMs) present a kind of topologically nontrivial quantum state of matter, which has massless Dirac fermions in the bulk and topologically protected states on certain surfaces. In superconducting DSMs, the effects of their nontrivial topology on superconducting pairing could realize topological superconductivity in the bulk or on the surface. As superconducting pairing takes place at the Fermi level E F, to make the effects possible, the Dirac points should lie in the vicinity of E F so that the topological electronic states can participate in the superconducting paring. Here, we show using angle-resolved photoelectron spectroscopy that in a series of (Ir1−x Pt x )Te2 compounds, the type-II Dirac points reside around E F in the superconducting region, in which the bulk superconductivity has a maximum T c of ~ 3 K. The realization of the coexistence of bulk superconductivity and low-energy Dirac fermions in (Ir1−x Pt x )Te2 paves the way for studying the effects of the nontrivial topology in DSMs on the superconducting state.

Subject Areas: Physics, Materials


Instruments: I05-ARPES

Other Facilities: Shanghai Synchrotron Radiation Facility; National Synchrotron Radiation Laboratory