Damping of a microelectromechanical oscillator in turbulent superfluid He4 : A probe of quantized vorticity in the ultralow temperature regime
Damping of a microelectromechanical oscillator in turbulent superfluid He4 : A probe of quantized vorticity in the ultralow temperature regime
复制标题
湍流超流体 He4 中微机电振荡器的阻尼：超低温状态下量子化涡度的探针
DOI：
10.1103/physrevb.101.174513
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发表时间：
2020
影响因子：
3.7
通讯作者：
Chan, H. B.
中科院分区：
文献类型：
--
作者：
Barquist, C. S.;Jiang, W. G.;Gunther, K.;Eng, N.;Lee, Y.;Chan, H. B.
本文报道了超流中量子湍流和量子化涡量对微电子机械系统(MEMS)谐振器运动的影响。我们发现，MEMS对流体中存在的量子湍流是唯一敏感的。为了在流体中产生湍流，石英音叉(Tf)被放置在MEMS附近并以大幅度驱动。我们观察到，在低速时，微电子机械系统受到湍流的抑制，当超过一个临界速度时，湍流的阻尼力大大降低。我们发现，随着速度的增加，MEMS的阻尼进一步减小，表明MEMS表面和构成湍流的量子化涡间存在依赖于速度的耦合。我们提出了流体中的涡旋与MEMS表面的相互作用的模型。这些器件对少量涡旋的敏感性和MEMS的几乎无限定制化为更全面地了解量子化涡旋与振荡结构之间的相互作用打开了大门，这反过来又为研究单个涡旋的动力学提供了一条新的途径。
We report a comprehensive investigation of the effects of quantum turbulence and quantized vorticity in superfluidon the motion of a microelectromechanical systems (MEMS) resonator. We find that the MEMS is uniquely sensitive to quantum turbulence present in the fluid. To generate turbulence in the fluid, a quartz tuning fork (TF) is placed in proximity to the MEMS and driven at a large amplitude. We observe that at low velocity, the MEMS is damped by the turbulence, and that above a critical velocity,, the turbulent damping is greatly reduced. We find that above, the damping of the MEMS is reduced further for increasing velocity, indicating a velocity dependent coupling between the surface of the MEMS and the quantized vortices constituting the turbulence. We propose a model of the interaction between vortices in the fluid and the surface of the MEMS. The sensitivity of these devices to a small number of vortices and the almost unlimited customization of MEMS open the door to a more complete understanding of the interaction between quantized vortices and oscillating structures, which in turn provides a new route for the investigation of the dynamics of single vortices.