Mechanical Dissipation Below <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mn>1</mml:mn><mml:mspace width="0.2em"/><mml:mi>μ</mml:mi><mml:mi>Hz</mml:mi></mml:math> with a Cryogenic Diamagnetic Levitated Micro-Oscillator
Yingchun Leng, Rui Li, Xi Kong, Han Xie, Di Zheng, Peiran Yin, Fang Xiong, Tong Wu, Chang-Kui Duan, Youwei Du, Zhang-qi Yin, Pu Huang, Jiangfeng Du
Abstract
Ultralow-dissipation mechanical systems play an important role in metrology and exploring macroscopic quantum phenomena. Here we report a diamagnetic levitated micromechanical oscillator operating at 3 K with measured dissipation down to $0.59\phantom{\rule{0.2em}{0ex}}\ensuremath{\mu}\mathrm{Hz}$ and a quality factor up to $2\ifmmode\times\else\texttimes\fi{}{10}^{7}$. This mechanical system achieves the lowest dissipation among the state-of-the-art microscale and nanoscale mechanical systems reported to date, with orders-of-magnitude reduction over other systems based on different principles. The cryogenic diamagnetic levitated oscillator is applicable on a wide range of mass, making it a good candidate system for ultrasensitive measurements of both force and acceleration. By virtue of the strong magnetic gradient, this system is potentially capable of studying quantum spin mechanics.