Hard Superconducting Gap in PbTe Nanowires

高益淳 ¹宋文玉 ¹杨帅 ¹于泽昊 ¹李睿东 ¹苗文韬 ¹王禹灏 ¹陈芳婷 ¹耿祖汗 ¹杨利宁 ¹夏泽洲 ¹冯硝 ²臧运祎 ³李琳 ⁴尚汝南 ³薛其坤 ⁵何珂 ²张浩⁶

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作者信息

1. State Key Laboratory of Low Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing 100084,China
2. State Key Laboratory of Low Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing 100084,China;Beijing Academy of Quantum Information Sciences,Beijing 100193,China;Frontier Science Center for Quantum Information,Beijing 100084,China;Hefei National Laboratory,Hefei 230088,China
3. Beijing Academy of Quantum Information Sciences,Beijing 100193,China;Hefei National Laboratory,Hefei 230088,China
4. Beijing Academy of Quantum Information Sciences,Beijing 100193,China
5. State Key Laboratory of Low Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing 100084,China;Beijing Academy of Quantum Information Sciences,Beijing 100193,China;Frontier Science Center for Quantum Information,Beijing 100084,China;Hefei National Laboratory,Hefei 230088,China;Southern University of Science and Technology,Shenzhen 518055,China
6. State Key Laboratory of Low Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing 100084,China;Beijing Academy of Quantum Information Sciences,Beijing 100193,China;Frontier Science Center for Quantum Information,Beijing 100084,China
折叠

Abstract

Semiconductor nanowires coupled to a superconductor provide a powerful testbed for quantum device physics such as Majorana zero modes and gate-tunable hybrid qubits.The performance of these quantum devices heavily relies on the quality of the induced superconducting gap.A hard gap,evident as vanishing subgap conductance in tunneling spectroscopy,is both necessary and desired.A hard gap has been achieved and extensively studied before in Ⅲ-Ⅴ semiconductor nanowires(InAs and InSb).In this study,we present the observation of a hard superconducting gap in PbTe nanowires coupled to a superconductor Pb.The gap size Δ is～1 meV(maximally 1.3meV in one device).Additionally,subgap Andreev bound states can also be created and controlled through gate tuning.Tuning a device into the open regime can reveal Andreev enhancement of the subgap conductance.These results pave the way for diverse superconducting quantum devices based on PbTe nanowires.

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基金项目

清华大学自主科研项目()

国家自然科学基金(92065206)

Innovation Program for Quantum Science and Technology(2021ZD0302400)

National Postdoctoral Researcher Program of China(GZC20231368)

出版年

2024

中国物理快报(英文版)

中国科学院物理研究所,中国物理学会

中国物理快报(英文版)

CSTPCDEI

影响因子：0.515

ISSN：0256-307X

参考文献量63

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