Anomalous Fraunhofer-like patterns in quantum anomalous Hall Josephson junction
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866916474686275584 |
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| author | Qi, Junjie Liu, Haiwen Liu, Jie Jiang, Hua Liu, Dong E. Chen, Chui-Zhen He, Ke Xie, X. C. |
| author_facet | Qi, Junjie Liu, Haiwen Liu, Jie Jiang, Hua Liu, Dong E. Chen, Chui-Zhen He, Ke Xie, X. C. |
| contents | The intriguing interplay between topology and superconductivity has attracted significant attention, given its potential for realizing topological superconductivity. In the quantum anomalous Hall insulators (QAHIs)-based junction, the supercurrents are carried by the chiral edge states, characterized by a $2Φ_0$ magnetic flux periodicity ($Φ_0 = h/2e$ is the flux quantum, $h$ the Planck constant, and $e$ the electron charge). However, experimental observations indicate the presence of bulk carriers in QAHI samples due to magnetic dopants. In this study, we reveal a systematic transition from edge-state to bulk-state dominant supercurrents as the chemical potential varies from the bulk gap to the conduction band. This results in an evolution from a $2Φ_0$-periodic oscillation pattern to an asymmetric Fraunhofer pattern. Furthermore, a novel Fraunhoher-like pattern emerges due to the coexistence of chiral edge states and bulk states caused by magnetic {\color{black}domains}, even when the chemical potential resides within the gap. These findings not only advance the theoretical understanding but also pave the way for the experimental discovery of the chiral Josephson effect based on QAHI doped with magnetic impurities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_00331 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Anomalous Fraunhofer-like patterns in quantum anomalous Hall Josephson junction Qi, Junjie Liu, Haiwen Liu, Jie Jiang, Hua Liu, Dong E. Chen, Chui-Zhen He, Ke Xie, X. C. Mesoscale and Nanoscale Physics The intriguing interplay between topology and superconductivity has attracted significant attention, given its potential for realizing topological superconductivity. In the quantum anomalous Hall insulators (QAHIs)-based junction, the supercurrents are carried by the chiral edge states, characterized by a $2Φ_0$ magnetic flux periodicity ($Φ_0 = h/2e$ is the flux quantum, $h$ the Planck constant, and $e$ the electron charge). However, experimental observations indicate the presence of bulk carriers in QAHI samples due to magnetic dopants. In this study, we reveal a systematic transition from edge-state to bulk-state dominant supercurrents as the chemical potential varies from the bulk gap to the conduction band. This results in an evolution from a $2Φ_0$-periodic oscillation pattern to an asymmetric Fraunhofer pattern. Furthermore, a novel Fraunhoher-like pattern emerges due to the coexistence of chiral edge states and bulk states caused by magnetic {\color{black}domains}, even when the chemical potential resides within the gap. These findings not only advance the theoretical understanding but also pave the way for the experimental discovery of the chiral Josephson effect based on QAHI doped with magnetic impurities. |
| title | Anomalous Fraunhofer-like patterns in quantum anomalous Hall Josephson junction |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2312.00331 |