A new Majorana platform in an Fe-As bilayer superconductor

Wenyao Liu, Lu Cao, Shiyu Zhu, Lingyuan Kong, Guangwei Wang, Michał Papaj, Peng Zhang, Ya-Bin Liu, Hui Chen, Geng Li, Fazhi Yang, Takeshi Kondo, Shixuan Du, Guang-Han Cao, Shik Shin, Liang Fu, Zhiping Yin, Hong-Jun Gao () and Hong Ding ()
Additional contact information
Wenyao Liu: Chinese Academy of Sciences
Lu Cao: Chinese Academy of Sciences
Shiyu Zhu: Chinese Academy of Sciences
Lingyuan Kong: Chinese Academy of Sciences
Guangwei Wang: Beijing Normal University
Michał Papaj: Massachusetts Institute of Technology
Peng Zhang: University of Tokyo
Ya-Bin Liu: Zhejiang University
Hui Chen: Chinese Academy of Sciences
Geng Li: Chinese Academy of Sciences
Fazhi Yang: Chinese Academy of Sciences
Takeshi Kondo: University of Tokyo
Shixuan Du: Chinese Academy of Sciences
Guang-Han Cao: Zhejiang University
Shik Shin: University of Tokyo
Liang Fu: Massachusetts Institute of Technology
Zhiping Yin: Beijing Normal University
Hong-Jun Gao: Chinese Academy of Sciences
Hong Ding: Chinese Academy of Sciences

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Iron-chalcogenide superconductors have emerged as a promising Majorana platform for topological quantum computation. By combining topological band and superconductivity in a single material, they provide significant advantage to realize isolated Majorana zero modes. However, iron-chalcogenide superconductors, especially Fe(Te,Se), suffer from strong inhomogeneity which may hamper their practical application. In addition, some iron-pnictide superconductors have been demonstrated to have topological surface states, yet no Majorana zero mode has been observed inside their vortices, raising a question of universality about this new Majorana platform. In this work, through angle-resolved photoemission spectroscopy and scanning tunneling microscopy/spectroscopy measurement, we identify Dirac surface states and Majorana zero modes, respectively, for the first time in an iron-pnictide superconductor, CaKFe4As4. More strikingly, the multiple vortex bound states with integer-quantization sequences can be accurately reproduced by our model calculation, firmly establishing Majorana nature of the zero mode.

Date: 2020
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DOI: 10.1038/s41467-020-19487-1

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