通过非对称的dc-SQUID测量电流相位关系的局限性
Ian Babich1, Andrei Kudriashov1, Denis Baranov1
1Advanced Mesoscience and Nanotechnology Centre, Moscow Institute of Physics and Technology, 141700, Dolgoprudny, Russia.
Nano letters
|July 10, 2023
概括
使用不对称的dc-SQUID测量约瑟逊连接点 (JJs) 的电流相位关系 (CPR) 可能会导致误解. 准确性取决于CPR衍生品,而不是临界电流,需要修订测量考虑因素.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子运输现象 量子运输现象
- 超导电性 超导电性 超导电性
背景情况:
- 约瑟夫森交点 (JJs) 呈现出奇特的量子运输现象,其特点是它们的电流相位关系 (CPR).
- 精确的CPR测量对于理解和利用这些现象在量子设备中至关重要.
- 一种常见的方法涉及非对称的dc-超导量子干扰装置 (dc-SQUIDs) 与参考JJ.
研究的目的:
- 通过使用混合JJs. 调查已建立的CPR测量方法的准确性.
- 在基于3D拓绝缘体 (TI) Bi2Te2Se.Se的混合JJ的CPR探测.
- 确定影响CPR测量精度的因素,并为可靠测量提供指导.
主要方法:
- 使用3D拓绝缘体Bi2Te2Se.使用混合JJs的制造.
- 在一个不对称的DC-SQUID配置中使用纳米桥作为参考JJ.
- 测量了关键电流振荡,以描述混合JJs的CPR.
主要成果:
- 在单个设备内观察到高度倾斜和侧面临界电流振荡,这与CPR预期的独特性相矛盾.
- 证明了CPR测量的准确性受到CPR衍生物中的不对称的影响.
- 发现临界电流不对称不是决定CPR测量精度的主要因素,与之前的假设相反.
结论:
- 广泛使用的dc-SQUID方法用于CPR测量,可能导致不准确的结果和误解.
- CPR测量的准确性严重依赖于CPR衍生物的不对称性,而不是关键电流.
- 提供了建议,以提高使用共同参考JJs的CPR测量的准确性.
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