Journal
SCIENCE
Volume 367, Issue 6473, Pages 64-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aax6361
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Funding
- ONR [N-000141512370]
- Penn State 2DCC-MIP under NSF [DMR-1539916]
- DOE [DE-SC0019064]
- NSF [DMR-1707340]
- NSF-CAREER award [DMR-1847811]
- ARO Young Investigator Program Award [W911NF1810198]
- Alfred P. Sloan Research Fellowship
- EU ERC-AG Programs [3-TOP]
- U.S. Department of Defense (DOD) [W911NF1810198] Funding Source: U.S. Department of Defense (DOD)
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A quantum anomalous Hall (QAH) insulator coupled to an s-wave superconductor is predicted to harbor chiral Majorana modes. A recent experiment interprets the half-quantized two-terminal conductance plateau as evidence for these modes in a millimeter-size QAH-niobium hybrid device. However, non-Majorana mechanisms can also generate similar signatures, especially in disordered samples. Here, we studied similar hybrid devices with a well-controlled and transparent interface between the superconductor and the QAH insulator. When the devices are in the QAH state with well-aligned magnetization, the two-terminal conductance is always half-quantized. Our experiment provides a comprehensive understanding of the superconducting proximity effect observed in QAH-superconductor hybrid devices and shows that the half-quantized conductance plateau is unlikely to be induced by chiral Majorana fermions in samples with a highly transparent interface.
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