Gate Tunable Supercurrent in Josephson Junctions Based on Bi_2Te_3 Topological Insulator Thin Films
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Wei-Xiong Wu,
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Yang Feng,
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Yun-He Bai,
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Yu-Ying Jiang,
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Zong-Wei Gao,
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Yuan-Zhao Li,
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Jian-Li Luan,
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Heng-An Zhou,
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Wan-Jun Jiang,
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Xiao Feng,
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Jin-Song Zhang,
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Hao Zhang,
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Ke He,
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Xu-Cun Ma,
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Qi-Kun Xue,
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Ya-Yu Wang
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Abstract
We report transport measurements on Josephson junctions consisting of Bi_2Te_3 topological insulator (TI) thin films contacted by superconducting Nb electrodes. For a device with junction length L = 134 nm, the critical supercurrent I_\rm c can be modulated by an electrical gate which tunes the carrier type and density of the TI film. I_\rm c can reach a minimum when the TI is near the charge neutrality regime with the Fermi energy lying close to the Dirac point of the surface state. In the p-type regime the Josephson current can be well described by a short ballistic junction model. In the n-type regime the junction is ballistic at 0.7 K < T < 3.8 K while for T < 0.7 K the diffusive bulk modes emerge and contribute a larger I_\rm c than the ballistic model. We attribute the lack of diffusive bulk modes in the p-type regime to the formation of p–n junctions. Our work provides new clues for search of Majorana zero mode in TI-based superconducting devices.
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Cite this article:
Wei-Xiong Wu, Yang Feng, Yun-He Bai, Yu-Ying Jiang, Zong-Wei Gao, Yuan-Zhao Li, Jian-Li Luan, Heng-An Zhou, Wan-Jun Jiang, Xiao Feng, Jin-Song Zhang, Hao Zhang, Ke He, Xu-Cun Ma, Qi-Kun Xue, Ya-Yu Wang. Gate Tunable Supercurrent in Josephson Junctions Based on Bi$_{2}$Te$_{3}$ Topological Insulator Thin Films[J].
Chin. Phys. Lett., 2021, 38(3): 037402.
DOI: 10.1088/0256-307X/38/3/037402
Wei-Xiong Wu, Yang Feng, Yun-He Bai, Yu-Ying Jiang, Zong-Wei Gao, Yuan-Zhao Li, Jian-Li Luan, Heng-An Zhou, Wan-Jun Jiang, Xiao Feng, Jin-Song Zhang, Hao Zhang, Ke He, Xu-Cun Ma, Qi-Kun Xue, Ya-Yu Wang. Gate Tunable Supercurrent in Josephson Junctions Based on Bi$_{2}$Te$_{3}$ Topological Insulator Thin Films[J]. Chin. Phys. Lett., 2021, 38(3): 037402. DOI: 10.1088/0256-307X/38/3/037402
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Wei-Xiong Wu, Yang Feng, Yun-He Bai, Yu-Ying Jiang, Zong-Wei Gao, Yuan-Zhao Li, Jian-Li Luan, Heng-An Zhou, Wan-Jun Jiang, Xiao Feng, Jin-Song Zhang, Hao Zhang, Ke He, Xu-Cun Ma, Qi-Kun Xue, Ya-Yu Wang. Gate Tunable Supercurrent in Josephson Junctions Based on Bi$_{2}$Te$_{3}$ Topological Insulator Thin Films[J]. Chin. Phys. Lett., 2021, 38(3): 037402. DOI: 10.1088/0256-307X/38/3/037402
Wei-Xiong Wu, Yang Feng, Yun-He Bai, Yu-Ying Jiang, Zong-Wei Gao, Yuan-Zhao Li, Jian-Li Luan, Heng-An Zhou, Wan-Jun Jiang, Xiao Feng, Jin-Song Zhang, Hao Zhang, Ke He, Xu-Cun Ma, Qi-Kun Xue, Ya-Yu Wang. Gate Tunable Supercurrent in Josephson Junctions Based on Bi$_{2}$Te$_{3}$ Topological Insulator Thin Films[J]. Chin. Phys. Lett., 2021, 38(3): 037402. DOI: 10.1088/0256-307X/38/3/037402
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