Cooling of levitated graphene nanoplatelets in high vacuum
Cooling of levitated graphene nanoplatelets in high vacuum
复制标题
高真空中悬浮石墨烯纳米片的冷却
DOI：
10.1063/1.4922705
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发表时间：
2015
影响因子：
4
通讯作者：
B. E. Kane
中科院分区：
文献类型：
--
作者：
P. Nagornykh;J. Coppock;B. E. Kane
我们展示了在高真空下，悬浮在四极离子阱中的带电石墨烯纳米片的质心运动冷却到20 K的温度。基于粒子运动的光学测量的参数反馈被用于在压力p < 10⁻⁶托时实现粒子冷却，并且观察到沿所有三个运动轴的冷却。通过改变一组用于在空间上移动陷阱最小值的辅助电极上的直流电压，测量了冷却对电场的依赖性。还探索了通过测量纳米片运动频率对放电的依赖性来校准其质量和电荷的方法。
We demonstrate cooling of the center of mass motion of charged graphene nanoplatelets levitated in a quadrupole ion trap in high vacuum down to temperatures of 20 K. Parametric feedback based on optical measurements of particle motion was used to achieve the particle cooling at pressure p < 10−6 Torr, and cooling along all three axes of motion was observed. Dependence of cooling on the electric fields was measured by varying DC voltages on a set of auxiliary electrodes used to spatially shift the trap minimum. Methods to calibrate mass and charge of the nanoplatelet by measuring its motion frequency dependence on discharge were also explored.