在kagome超导体Josephson二极管中的量子化无线电频率校正
Han-Xin Lou1, Jing-Jing Chen2, Xing-Guo Ye1,2
1State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing, China.
Nature nanotechnology
|January 30, 2026
概括
使用CsV3Sb5的超导二极管可以从无线电频率 (RF) 辐射中实现量子化直流电压,而无需外部偏差. 这一突破使得自动供电的冷设备和电压标准成为可能.
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
- 量子电子学 量子电子学
背景情况:
- 超导二极管为先进的电子和冷应用提供了低分散的整形.
- 在没有外部偏差的情况下从射频辐射中产生量化直流电压对于自动供电的冷设备至关重要,但仍然具有挑战性.
研究的目的:
- 在零磁场的超导材料中演示量子化无线电频率 (RF) 校正.
- 探索CsV3Sb5作为新型冷电子应用平台的潜力.
主要方法:
- 从机械剥落的CsV3Sb5单晶纳米光束制造运输设备.
- 在没有外部磁场的情况下,约瑟夫森效应和约瑟夫森二极管的行为特征.
- 在射频辐射下测量直流电压的产生及其对频率和功率的依赖.
主要成果:
- 在零磁场下的CsV3Sb5设备中展示了约瑟夫森二极管效应.
- 在无偏差的射频辐射下,观察到量化直流电压与微波频率 (Vdc = hf/2e) 线性扩展.
- 报告了随着RF功率的增加而增加的量化电压步骤,表明了Shapiro步骤.
结论:
- CsV3Sb5表现出内在的约瑟夫森二极管行为,使量子化射频校正能够在没有外部磁场的情况下进行.
- 这些发现确立了CsV3Sb5作为开发低温无线电源的有希望材料.
- 这项研究为在极低温度下运行的自供电电压标准铺平了道路.
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