Cherenkov friction on a neutral particle moving parallel to a dielectric
Cherenkov friction on a neutral particle moving parallel to a dielectric
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DOI：
10.1088/0953-8984/27/21/214001
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发表时间：
2014-02
期刊：
影响因子：
--
通讯作者：
G. Pieplow;C. Henkel
中科院分区：
文献类型：
--
作者：
G. Pieplow;C. Henkel
基于完全相对论框架和局域平衡假设，我们描述了平行于介质运动的粒子的一种简单的量子摩擦机制。切伦科夫效应解释了裸基态如何变得全局不稳定，以及电磁场和粒子偶极子的涨落如何转化为激发对。将粒子模拟为银纳米球，研究了力谱及其与速度的关系。我们发现，在切伦科夫阈值速度附近，银粒子中等离子体激元共振的衰减具有较强的影响。我们还给出了有阻尼点和无阻尼点的摩擦力在阈值速度附近的展开式。
We describe a simple mechanism of quantum friction for a particle moving parallel to a dielectric, based on a fully relativistic framework and the assumption of local equilibrium. The Cherenkov effect explains how the bare ground state becomes globally unstable and how fluctuations of the electromagnetic field and the particle’s dipole are converted into pairs of excitations. Modeling the particle as a silver nano-sphere, we investigate the spectrum of the force and its velocity dependence. We find that the damping of the plasmon resonance in the silver particle has a relatively strong impact near the Cherenkov threshold velocity. We also present an expansion of the friction force near the threshold velocity for both damped and undamped particles.