Electric feedback cooling of single charged nanoparticles in an optical trap
Electric feedback cooling of single charged nanoparticles in an optical trap
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DOI：
10.1103/physreva.99.051401
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发表时间：
2019-05-16
影响因子：
2.9
通讯作者：
Aikawa, K.
中科院分区：
文献类型：
--
作者：
Iwasaki, M.;Yotsuya, T.;Aikawa, K.
我们证明了反馈冷却的质量中心运动的单个带电纳米粒子的毫开尔文温度在三维空间中，通过施加振荡电场同步到他们的光学观察到的运动。在弱反馈下观察到的运动温度与一个简单的模型一致，并允许我们估计被困纳米粒子的电荷数。我们的模型和实验之间的协议被证实的电荷数的独立测量的基础上的偏移引起的振荡频率由恒定的电场。在4 × 10（-3）Pa下，所展示的小于10 mK的温度比在该压力下使用常规光学冷却方法的温度低一到两个数量级。我们的研究结果形成了操纵冷带电纳米粒子的基础，并为在基态附近捕获纳米粒子的量子力学研究铺平了道路。
We demonstrate feedback cooling of the center-of-mass motion of single charged nanoparticles to millikelvin temperatures in three dimensions via applying oscillating electric fields synchronized to their optically observed motion. The observed motional temperatures at weak feedback agree with a simple model and allow us to estimate the charge number of trapped nanoparticles. The agreement between our model and experiments is confirmed by independent measurements of the charge numbers based on a shift in the oscillation frequency induced by a constant electric field. The demonstrated temperature of less than 10 mK at 4 x 10(-3) Pa is lower than that with the conventional optical cooling approach at this pressure by one to two orders of magnitude. Our results form the basis of manipulating cold charged nanoparticles and pave the way to quantum mechanical studies with trapped nanoparticles near their ground state.