中国物理B ›› 2022, Vol. 31 ›› Issue (10): 107402-107402.doi: 10.1088/1674-1056/ac89d4

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Ac Josephson effect in Corbino-geometry Josephson junctions constructed on Bi2Te3 surface

Yunxiao Zhang(张云潇)1,2, Zhaozheng Lyu(吕昭征)1,2,†,‡, Xiang Wang(王翔)1,2, Enna Zhuo(卓恩娜)1,2, Xiaopei Sun(孙晓培)1,2, Bing Li(李冰)1,2, Jie Shen(沈洁)1,2,3, Guangtong Liu(刘广同)1,2,3,4, Fanming Qu(屈凡明)1,2,3,4, and Li Lü(吕力)1,2,3,4,§   

  1. 1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Songshan Lake Materials Laboratory, Dongguan 523808, China;
    4. Hefei National Laboratory, Hefei 230088, China
  • 收稿日期:2022-08-07 出版日期:2022-10-16 发布日期:2022-09-24
  • 通讯作者: Zhaozheng Lyu, Li Lü E-mail:lyuzhzh@iphy.ac.cn;lilu@iphy.ac.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 92065203, 11527806, 12074417, 11874406, 11774405, and E2J1141), the National Basic Research Program of China (Grant Nos. 2016YFA0300601, 2017YFA0304700, and 2015CB921402), the Strategic Priority Research Program B of the Chinese Academy of Sciences (Grant Nos. XDB33010300, DB28000000, and XDB07010100), the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD302600), and Synergetic Extreme Condition User Facility (SECUF) sponsored by the National Development and Reform Commission, China.

Ac Josephson effect in Corbino-geometry Josephson junctions constructed on Bi2Te3 surface

Yunxiao Zhang(张云潇)1,2, Zhaozheng Lyu(吕昭征)1,2,†,‡, Xiang Wang(王翔)1,2, Enna Zhuo(卓恩娜)1,2, Xiaopei Sun(孙晓培)1,2, Bing Li(李冰)1,2, Jie Shen(沈洁)1,2,3, Guangtong Liu(刘广同)1,2,3,4, Fanming Qu(屈凡明)1,2,3,4, and Li Lü(吕力)1,2,3,4,§   

  1. 1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Songshan Lake Materials Laboratory, Dongguan 523808, China;
    4. Hefei National Laboratory, Hefei 230088, China
  • Received:2022-08-07 Online:2022-10-16 Published:2022-09-24
  • Contact: Zhaozheng Lyu, Li Lü E-mail:lyuzhzh@iphy.ac.cn;lilu@iphy.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 92065203, 11527806, 12074417, 11874406, 11774405, and E2J1141), the National Basic Research Program of China (Grant Nos. 2016YFA0300601, 2017YFA0304700, and 2015CB921402), the Strategic Priority Research Program B of the Chinese Academy of Sciences (Grant Nos. XDB33010300, DB28000000, and XDB07010100), the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD302600), and Synergetic Extreme Condition User Facility (SECUF) sponsored by the National Development and Reform Commission, China.

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摘要： Recently, a Corbino-geometry type of Josephson junction constructed on the surface of topological insulators has been proposed for hosting and braiding Majorana zero modes. As a first step to test this proposal, we successfully fabricated Corbino-geometry Josephson junctions (JJs) on the surface of Bi2Te3 flakes. Ac Josephson effect with fractional Shapiro steps was observed in the Corbino-geometry JJs while the flux in the junction area was quantized. By analyzing the experimental data using the resistively shunted Josephson junction model, we found that the Corbino-geometry JJs exhibit a skewed current—phase relation due to its high transparency. The results suggest that Corbino-geometry JJs constructed on the surface of topological insulators may provide a promising platform for studying Majorana-related physics.

关键词: Corbino-geometry Josephson junction, topological insulator, ac Josephson effect, fractional Shapiro steps

Abstract: Recently, a Corbino-geometry type of Josephson junction constructed on the surface of topological insulators has been proposed for hosting and braiding Majorana zero modes. As a first step to test this proposal, we successfully fabricated Corbino-geometry Josephson junctions (JJs) on the surface of Bi2Te3 flakes. Ac Josephson effect with fractional Shapiro steps was observed in the Corbino-geometry JJs while the flux in the junction area was quantized. By analyzing the experimental data using the resistively shunted Josephson junction model, we found that the Corbino-geometry JJs exhibit a skewed current—phase relation due to its high transparency. The results suggest that Corbino-geometry JJs constructed on the surface of topological insulators may provide a promising platform for studying Majorana-related physics.

Key words: Corbino-geometry Josephson junction, topological insulator, ac Josephson effect, fractional Shapiro steps

中图分类号:  (Tunneling phenomena; Josephson effects)

  • 74.50.+r
85.25.Cp (Josephson devices) 05.60.Gg (Quantum transport)