A new Majorana platform in an Fe-As bilayer superconductor
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s41467-020-19487-1.pdf
Description
Published version
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2.11 MB
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Checksum (MD5)
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Author(s)
Liu, Wenyao
Cao, Lu
Zhu, Shiyu
Kong, Lingyuan
Wang, Guangwei
Papaj, Michał
Zhang, Peng
Liu, Ya-Bin
Chen, Hui
Li, Geng
Date Issued
2020
Journal
Nature Communications
Publisher
Springer Science and Business Media LLC
Citation
Liu, Wenyao, Cao, Lu, Zhu, Shiyu, Kong, Lingyuan, Wang, Guangwei et al. 2020. "A new Majorana platform in an Fe-As bilayer superconductor." Nature Communications, 11 (1).
Version
Final published version
Abstract
© 2020, The Author(s). 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1038/S41467-020-19487-1
