旋转YIG纳米球中真空摩擦的巨大增强
Giant Enhancement of Vacuum Friction in Spinning YIG Nanospheres
AI总结：
针对真空摩擦效应过弱、难以观测的问题，本文利用YIG近场磁局域态密度使旋转纳米球的真空辐射增强八个数量级，并给出可实验观测的装置方案。
摘要：
由于真空辐射和真空摩擦力矩在实际系统中的效应极其微弱，对它们的实验观测颇具挑战。例如，自由空间中旋转的纳米球会因真空涨落产生的摩擦而减速，其停止时间约等于宇宙年龄。本文表明，靠近铝或YIG平板的旋转钇铁石榴石（YIG）纳米球所表现出的真空辐射，比其他金属或介电旋转纳米球大八个数量级。我们利用YIG系统中较大的近场磁局域态密度实现了这种巨大增强，该态密度出现在与旋转频率相当的低频GHz区间。此外，我们提出了一套现实可行的实验装置，用于在实验可达到的条件下观测这种强真空辐射和摩擦力矩效应。
英文摘要：
Experimental observations of vacuum radiation and vacuum frictional torque are challenging due to their vanishingly small effects in practical systems. For example, a rotating nanosphere in free space slows down due to friction from vacuum fluctuations with a stopping time around the age of the universe. Here, we show that a spinning yttrium iron garnet (YIG) nanosphere near aluminum or YIG slabs exhibits vacuum radiation eight orders of magnitude larger than other metallic or dielectric spinning nanospheres. We achieve this giant enhancement by exploiting the large near-field magnetic local density of states in YIG systems, which occurs in the low-frequency GHz regime comparable to the rotation frequency. Furthermore, we propose a realistic experimental setup for observing the effects of this large vacuum radiation and frictional torque under experimentally accessible conditions.
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