纳米尺度超流机电学中的动力学反作用
Dynamical backaction in nanoscale superfluid electromechanics
- Faculty of Mathematics and Physics, Charles University（查理大学数学物理学院）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究开发耦合第四声声学谐振与超导LC谐振电路的机电系统，演示相关效应并实现对量子涡旋的探测，为纳米尺度超流机电学中量子涡旋的研究提供了新方法。
AI中文摘要：
采用超流$^4$He的纳米流体声学谐振器可用于研究从二维超流湍流的集体行为到旋转产生的少量单个量子涡旋的量子涡旋。为了将灵敏度提升至探测单个量子涡旋所需的水平，采用光机械或光机械启发方法的读出机制颇具前景。本研究开发了一种机电系统，在边带分辨 regime 下将第四声声学谐振与超导LC谐振电路耦合。利用该系统，演示了机电诱导透明（EMIT）、光弹簧效应以及光机械边带阻尼与放大。此外，通过旋转低温恒温器，证明了对量子涡旋的灵敏度，这些涡旋可在纳米流体体积内以雪崩状过程被捕获和释放。
英文摘要：
Nanofluidic acoustic resonators employing superfluid $^4$He can be used to study quantized vortices from collective behavior in two-dimensional superfluid turbulence down to few individual vortices created by rotation. In order to improve sensitivity to the level needed for probing individual quantized vortices, readout mechanisms employing optomechanical or optomechanics-inspired approaches seem to be promising in this regard. In this work, we develop an electromechanical system, which couples a 4$^\mathrm{th}$ sound acoustic resonance to a superconducting LC tank circuit in a sideband-resolved regime. Using this system, we demonstrate electromechanically induced transparency (EMIT), optical spring effect and optomechanical sideband damping and amplification. Furthermore, by rotating the cryostat, we demonstrate sensitivity to quantized vortices, which can become trapped and released in avalanche-like process inside the nanofluidic volume.
