论文标题
延迟对电子气体二维磁盘中等离子体共振的频率和线宽的影响
Effect of retardation on the frequency and linewidth of plasma resonances in a two-dimensional disk of electron gas
论文作者
论文摘要
我们理论上通过计算入射电磁波的吸收来分析电子气体二维磁盘中的显性血浆模式。考虑到电磁阻滞效应，该问题以自洽的近似值解决。我们使用DRUDE模型来描述系统的电导率。吸收光谱表现出一系列与血浆波激发相对应的峰。指定峰的位置和线宽分别是等离子体模式的频率和阻尼率。我们在数值和分析上估算了延迟影响对基本（偶极）和轴对称（四倍）等离子体模式的频率和线宽的影响。我们发现，模式的净阻尼率不仅取决于辐射和碰撞衰变的总和，而且还取决于它们的混合，即使是为了降低较小的降低。我们表明，净阻尼率可能明显小于仅碰撞确定的阻尼率。
We theoretically analyze dominant plasma modes in a two-dimensional disk of electron gas by calculating the absorption of an incident electromagnetic wave. The problem is solved in a self-consistent approximation, taking into account electromagnetic retardation effects. We use the Drude model to describe the conductivity of the system. The absorption spectrum exhibits a series of peaks corresponding to the excitation of plasma waves. The position and linewidth of the peaks designating, respectively, the frequency and damping rate of the plasma modes. We estimate the influence of retardation effects on the frequency and linewidth of the fundamental (dipole) and axisymmetric (quadrupole) plasma modes both numerically and analytically. We find the net damping rate of the modes to be dependent on not only the sum of the radiative and collisional decays but also their intermixture, even for small retardation. We show that the net damping rate can be noticeably less than that determined by collisions alone.
