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arXiv 1608.01871cond-mat.mes-hall
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MoRe超导金属圆筒中的机械耗散

Mechanical dissipation in MoRe superconducting metal drums

S. Yanai, V. Singh, M. Yuan, M. Gely, S. J. Bosman, G. A. Steele

摘要:

实验研究了由无序超导钼铼(MoRe)合金薄膜制成的机械谐振器中的损耗。通过静电驱动鼓与谐振交流电压,我们检测其运动使用超导微波腔。从机械共振频率和品质因数的温度依赖性,我们发现的非共振,机械激活的二能级系统(TLS)限制其品质因数在低温的证据。此外,我们观察到一个强大的抑制机械耗散在大的机械驱动振幅,这表明非常规的饱和的非共振TLS。这些新的观察揭示了超导鼓的机械阻尼机制和理解这种机械系统中耗散的途径。

英文摘要:

We experimentally investigate dissipation in mechanical resonators made of a disordered superconducting thin film of Molybdenum-Rhenium(MoRe) alloy. By electrostatically driving the drum with a resonant AC voltage, we detect its motion using a superconducting microwave cavity. From the temperature dependence of mechanical resonance frequencies and quality factors, we find evidence for non-resonant, mechanically active two-level systems (TLSs) limiting its quality factor at low temperature. In addition, we observe a strong suppression of mechanical dissipation at large mechanical driving amplitudes, suggesting an unconventional saturation of the non-resonant TLSs. These new observations shed light on the mechanism of mechanical damping in superconducting drums and routes towards understanding dissipation in such mechanical systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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