测量普通金属环中持续电流的高灵敏度双极杆
High sensitivity cantilevers for measuring persistent currents in normal metal rings
摘要：
我们提出了一种新的方法来测量正常金属环中的持续电流。通过将微米级金属环集成到敏感的微机械杠杆中，并将杠杆用作扭矩磁力计，应该可以测量环的持续电流，其灵敏度比过去使用的基于SQUID和基于微波谐振器的检测器更高。此外，基于MEMS的检测器可以允许在更清洁的电磁环境中进行测量。我们制作了具有集成环的超灵敏悬臂梁，并测量了它们的机械性能。我们提出了一个估计的持续电流的灵敏度，这些基于悬臂梁的探测器，专注于悬臂梁的布朗运动和散粒噪声的激光干涉仪，监测悬臂梁的限制。
英文摘要：
We propose a new approach to measuring persistent currents in normal metal rings. By integrating micron-scale metal rings into sensitive micromechanical cantilevers and using the cantilevers as torque magnetometers, it should be possible to measure the rings' persistent currents with greater sensitivity than the SQUID-based and microwave resonator-based detectors used in the past. In addition, cantilever-based detectors may allow for measurements in a cleaner electromagnetic environment. We have fabricated ultra sensitive cantilevers with integrated rings and measured their mechanical properties. We present an estimate of the persistent current sensitivity of these cantilever-based detectors, focusing on the limits set by the cantilever's Brownian motion and the shot noise in the laser interferometer that monitors the cantilever.
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