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在离子束图案中的大型超导二极管效应基于Sn的超导纳米线/拓的迪拉克半金属平面异构结构

Le Duc Anh^1,2,3, Keita Ishihara⁴, Tomoki Hotta⁴

¹Department of Electrical Engineering and Information Systems, The University of Tokyo, Bunkyo-ku, Tokyo, Japan. anh@cryst.t.u-tokyo.ac.jp.

Nature communications

|September 30, 2024

概括

研究人员在拓的迪拉克半金属膜上创建了纳米级的超导模式. 这使得拓超导和Majorana物理学的研究成为可能,显示出显著的超导二极管效应.

科学领域:

凝聚物质物理学凝聚物质物理学
材料科学材料科学材料科学
量子物理学量子物理学是一种量子物理学.

背景情况:

高质量的超导体/拓材料异构结构对于推进拓超导和Majorana物理学至关重要.
创建这些异构结构的现有方法可能很复杂,并限制了设备设计.

研究的目的:

开发一种直接的,纳米级的制造方法,用于拓德拉克半金属 (TDS) 薄膜上的超导模式.
研究这些新型异构结构中的超导特性和潜在量子现象.

主要方法:

使用聚焦离子束来照射拓的迪拉克半金属 (TDS) α-Sn薄膜.
利用热诱导的α-Sn的相位过渡转化为超导β-Sn,直接生成纳米尺度的模式.
描述在α-Sn膜内制造的β-Sn纳米线的超导特性,包括超导二极管效应 (SDE).

主要成果:

成功地制造了纳米级超导β-Sn图案,直接贴在TDS α-Sn薄膜上.
在嵌在α-Sn膜中的β-Sn纳米线中观察到显著的超导二极管效应 (SDE),在特定磁场条件下,校正比率达到35%.
假设SDE起源于α-Sn/β-Sn接口,这是由于近距离效应引起的,从而诱导TDSα-Sn中的超导.

结论:

聚焦离子束方法为创建定制形状的拓超导电路提供了一个多功能平台.
这种技术促进了量子物理的研究和基于拓超导的设备的开发.
观察到的SDE突出了这些异构结构在新型电子应用中的潜力.

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