Enhanced and modulable induced superconducting gap and effective Landé g-factor in Pb-InSb hybrid devices
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916777964863488 |
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| author | Li, Guoan Shi, Xiaofan Dou, Ziwei Yang, Guang Shi, Jiayu Rossi, Marco Badawy, Ghada Song, Yuxiao Zhang, Ruixuan Li, Yupeng Zhang, Zhiyuan Wang, Anqi Guo, Xingchen Deng, Xiao Tong, Bingbing Li, Peiling Lyu, Zhaozheng Liu, Guangtong Qu, Fanming Bakkers, Erik P. A. M. Nowak, Michał P. Wójcik, Paweł Lu, Li Shen, Jie |
| author_facet | Li, Guoan Shi, Xiaofan Dou, Ziwei Yang, Guang Shi, Jiayu Rossi, Marco Badawy, Ghada Song, Yuxiao Zhang, Ruixuan Li, Yupeng Zhang, Zhiyuan Wang, Anqi Guo, Xingchen Deng, Xiao Tong, Bingbing Li, Peiling Lyu, Zhaozheng Liu, Guangtong Qu, Fanming Bakkers, Erik P. A. M. Nowak, Michał P. Wójcik, Paweł Lu, Li Shen, Jie |
| contents | The hybrid system of a conventional superconductor (SC) on a semiconductor (SM) nanowire with strong spin-orbit coupling (SOC) represents a promising platform for achieving topological superconductivity and Majorana zero modes (MZMs) towards topological quantum computation. While aluminum (Al)-based hybrid nanowire devices have been widely utilized, their limited superconducting gap and intrinsic weak SOC as well as small Landé g-factor may hinder future experimental advancements. In contrast, we demonstrate that lead (Pb)-based hybrid quantum devices exhibit a remarkably large and hard proximity-induced superconducting gap, exceeding that of Al by an order of magnitude. By exploiting electrostatic gating to modulate wavefunction distribution and SC-SM interfacial coupling, this gap can be continuously tuned from its maximum value (~1.4 meV, matching the bulk Pb gap) down to nearly zero while maintaining the hardness. Furthermore, magnetic-field-dependent measurements reveal a radial evolution of the gap structure with anti-crossing feature, indicative of strong SOC and huge effective g-factors up to 76. These findings underscore the superior functionality of Pb-based hybrid systems, significantly advancing their potential for realizing and stabilizing MZMs and the further scalable topological quantum architectures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_03563 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Enhanced and modulable induced superconducting gap and effective Landé g-factor in Pb-InSb hybrid devices Li, Guoan Shi, Xiaofan Dou, Ziwei Yang, Guang Shi, Jiayu Rossi, Marco Badawy, Ghada Song, Yuxiao Zhang, Ruixuan Li, Yupeng Zhang, Zhiyuan Wang, Anqi Guo, Xingchen Deng, Xiao Tong, Bingbing Li, Peiling Lyu, Zhaozheng Liu, Guangtong Qu, Fanming Bakkers, Erik P. A. M. Nowak, Michał P. Wójcik, Paweł Lu, Li Shen, Jie Mesoscale and Nanoscale Physics Superconductivity Quantum Physics The hybrid system of a conventional superconductor (SC) on a semiconductor (SM) nanowire with strong spin-orbit coupling (SOC) represents a promising platform for achieving topological superconductivity and Majorana zero modes (MZMs) towards topological quantum computation. While aluminum (Al)-based hybrid nanowire devices have been widely utilized, their limited superconducting gap and intrinsic weak SOC as well as small Landé g-factor may hinder future experimental advancements. In contrast, we demonstrate that lead (Pb)-based hybrid quantum devices exhibit a remarkably large and hard proximity-induced superconducting gap, exceeding that of Al by an order of magnitude. By exploiting electrostatic gating to modulate wavefunction distribution and SC-SM interfacial coupling, this gap can be continuously tuned from its maximum value (~1.4 meV, matching the bulk Pb gap) down to nearly zero while maintaining the hardness. Furthermore, magnetic-field-dependent measurements reveal a radial evolution of the gap structure with anti-crossing feature, indicative of strong SOC and huge effective g-factors up to 76. These findings underscore the superior functionality of Pb-based hybrid systems, significantly advancing their potential for realizing and stabilizing MZMs and the further scalable topological quantum architectures. |
| title | Enhanced and modulable induced superconducting gap and effective Landé g-factor in Pb-InSb hybrid devices |
| topic | Mesoscale and Nanoscale Physics Superconductivity Quantum Physics |
| url | https://arxiv.org/abs/2506.03563 |