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| DOI | 10.1126/science.aax6361 |
| Absence of evidence for chiral Majorana modes in quantum anomalous Hall-superconductor devices | |
| Kayyalha M.; Xiao D.; Zhang R.; Shin J.; Jiang J.; Wang F.; Zhao Y.-F.; Xiao R.; Zhang L.; Fijalkowski K.M.; Mandal P.; Winnerlein M.; Gould C.; Li Q.; Molenkamp L.W.; Chan M.H.W.; Samarth N.; Chang C.-Z. | |
| 发表日期 | 2020 |
| ISSN | 0036-8075 |
| 起始页码 | 64 |
| 结束页码 | 67 |
| 卷号 | 367期号:6473 |
| 英文摘要 | 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. © 2020 American Association for the Advancement of Science. All rights reserved. |
| 关键词 | niobiuminstrumentationmagnetizationquantum mechanicssuperconductivityArticlechiralityelectric conductancefermionmagnetismmathematical modelparticle sizepredictionpriority journalquantum anomalous Hall insulatorquantum theoryMajorana |
| 语种 | 英语 |
| 来源机构 | Science |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/133818 |
| 推荐引用方式 GB/T 7714 | Kayyalha M.,Xiao D.,Zhang R.,et al. Absence of evidence for chiral Majorana modes in quantum anomalous Hall-superconductor devices[J]. Science,2020,367(6473). |
| APA | Kayyalha M..,Xiao D..,Zhang R..,Shin J..,Jiang J..,...&Chang C.-Z..(2020).Absence of evidence for chiral Majorana modes in quantum anomalous Hall-superconductor devices.,367(6473). |
| MLA | Kayyalha M.,et al."Absence of evidence for chiral Majorana modes in quantum anomalous Hall-superconductor devices".367.6473(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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