超电流二极管和异常的约瑟夫森效应之间的联系是由门控制的干扰度检测揭示的.
S Reinhardt1, T Ascherl1, A Costa2
1Institut für Experimentelle und Angewandte Physik, University of Regensburg, Regensburg, Germany.
Nature communications
|May 23, 2024
概括
约瑟夫森二极管由于电流相位不对称而表现出极性依赖的临界电流. 这项研究将异常的约瑟夫森效应 (φ0-shift) 与弹道连接处的超电流二极管效应联系起来,突出显示了旋转轨道相互作用.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子信息科学 量子信息科学
- 这就是Spintronics.
背景情况:
- 约瑟夫森二极管利用电流相位关系中的不对称性来实现非互惠的超级电流流.
- 异常的约瑟夫森效应,以φ0转移为特征,是旋转轨道相互作用的弹道连接处超级电流非互惠的关键机制.
研究的目的:
- 调查在同一约瑟夫森连接处内的φ0转移和超电流二极管效率的同时发生和相互作用.
- 通过静电门,建立 φ0 转移和超电流二极管效应之间的直接相关性.
主要方法:
- 使用超导量子干扰仪同时测量φ0转移和二极管效率.
- 采用静电门作为可调节的参数来修改连接属性并观察它们对观察到的现象的影响.
主要成果:
- 证明了φ0转移与超电流二极管效应之间的直接,经过实验验证的联系.
- 证实了旋转轨道相互作用和齐曼场在控制磁性形异性和超电流二极管行为的关键作用.
结论:
- φ0-shift与约瑟夫森连接处的超电流二极管效应密切相关.
- 旋转轨道相互作用和齐曼场是实现和控制超导装置中磁性合异性和超电流二极管功能的关键因素.
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