期刊
PHYSICAL REVIEW X
卷 8, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.8.041056
关键词
Condensed Matter Physics
资金
- National Natural Science Foundation of China
- National Key R&D Program of the MOST of China [2016YFA0300200, 2017YFA0303004, 2017YFA0303104, 2016YFA0302300, 2017YFA0303003]
- National Basic Research Program of China (973 Program) [2015CB921700]
- Science Challenge Project [TZ2016004]
- CAS [QYZDY-SSWSLH001]
- Fundamental Research Funds for the Central Universities [310421113]
The Majorana fermion, which is its own antiparticle and obeys non-Abelian statistics, plays a critical role in topological quantum computing. It can be realized as a bound state at zero energy, called a Majorana zero mode (MZM), in the vortex core of a topological superconductor, or at the ends of a nanowire when both superconductivity and strong spin orbital coupling are present. A MZM can be detected as a zero-bias conductance peak (ZBCP) in tunneling spectroscopy. However, in practice, clean and robust MZMs have not been realized in the vortices of a superconductor because of contamination from impurity states or other closely packed Caroli-de Gennes-Matricon (CdGM) states, which hampers further manipulations of MZMs. Here, using scanning tunneling spectroscopy, we show that a ZBCP well separated from the other discrete CdGM states exists ubiquitously in the cores of free vortices in the defect-free regions of (Li0.84Fe0.16)OHFeSe, which has a superconducting transition temperature of 42 K. Moreover, a Diraccone-type surface state is observed by angle-resolved photoemission spectroscopy, and its topological nature is confirmed by band calculations. The observed ZBCP can naturally be attributed to a MZM arising from the chiral topological surface state of a bulk superconductor. Thus, (Li0.84Fe0.16)OHFeSe provides an ideal platform for studying MZMs and topological quantum computing.
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