期刊
NATURE COMMUNICATIONS
卷 11, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-020-19487-1
关键词
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资金
- National Natural Science Foundation of China [11888101, 61888102, 51991340]
- Chinese Academy of Sciences [XDB28000000, XDB07000000]
- Ministry of Science and Technology of China [2016YFA0202300, 2019YFA0308500, 2018YFA0305800]
- Beijing Municipal Science AMP
- Technology Commission [Z191100007219012]
- NSFC [11674030]
- Funds for the Central Universities [310421113]
- National Key Research and Development Program of China [2016YFA0302300, 2019FZA3004, 2017YFA0303002, 2016YFA0300202]
- US DOE [DE-SC0019275]
- JSPS KAKENHI [JP18H01165, JP19F19030, JP19H00651]
- Funds for the Central Universities
- U.S. Department of Energy (DOE) [DE-SC0019275] Funding Source: U.S. Department of Energy (DOE)
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. Iron-pnictide superconductors share similar topological band structure with iron-chalcogenide superconductors, but no Majorana modes have been observed in the former. Here, the authors observe both the superconducting Dirac surface states and Majorana zero modes inside its vortex cores in CaKFe4As4.
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