Interfering Josephson diode effect in Ta2Pd3Te5 asymmetric edge interferometer

Yupeng Li, Dayu Yan, Yu Hong, Haohao Sheng, Anqi Wang, Ziwei Dou, Xingchen Guo, Xiaofan Shi, Zikang Su, Zhaozheng Lyu, Tian Qian, Guangtong Liu, Fanming Qu, Kun Jiang, Zhijun Wang, Youguo Shi (), Zhu-An Xu, Jiangping Hu, Li Lu () and Jie Shen ()
Additional contact information
Yupeng Li: Chinese Academy of Sciences
Dayu Yan: Chinese Academy of Sciences
Yu Hong: Chinese Academy of Sciences
Haohao Sheng: Chinese Academy of Sciences
Anqi Wang: Chinese Academy of Sciences
Ziwei Dou: Chinese Academy of Sciences
Xingchen Guo: Chinese Academy of Sciences
Xiaofan Shi: Chinese Academy of Sciences
Zikang Su: Chinese Academy of Sciences
Zhaozheng Lyu: Chinese Academy of Sciences
Tian Qian: Chinese Academy of Sciences
Guangtong Liu: Chinese Academy of Sciences
Fanming Qu: Chinese Academy of Sciences
Kun Jiang: Chinese Academy of Sciences
Zhijun Wang: Chinese Academy of Sciences
Youguo Shi: Chinese Academy of Sciences
Zhu-An Xu: Zhejiang University
Jiangping Hu: Chinese Academy of Sciences
Li Lu: Chinese Academy of Sciences
Jie Shen: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Edge states in topological systems have attracted great interest due to their robustness and linear dispersions. Here a superconducting-proximitized edge interferometer is engineered on a topological insulator Ta2Pd3Te5 with asymmetric edges to realize the interfering Josephson diode effect (JDE), which hosts many advantages, such as the high efficiency as much as 73% at tiny applied magnetic fields with an ultra-low switching power around picowatt. As an important element to induce such JDE, the second-order harmonic in the current-phase relation is also experimentally confirmed by half-integer Shapiro steps. The interfering JDE is also accompanied by the antisymmetric second harmonic transport, which indicates the corresponding asymmetry in the interferometer, as well as the polarity of JDE. This edge interferometer offers an effective method to enhance the performance of JDE, and boosts great potential applications for future superconducting quantum devices.

Date: 2024
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DOI: 10.1038/s41467-024-53383-2

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