论文标题
电导率的Drude-Smith模型：从头推导和解释
The Drude-Smith Model for Conductivity: de novo Derivation and Interpretation
论文作者
论文摘要
Drude-Smith模型成功地描述了令人惊讶的广泛系统，尤其是在Terahertz地区的频率和相分辨的电导率数据。尽管如此，它的解释仍不清楚，因为它的原始推导是有缺陷的。我们使用直观的物理框架来得出Drude-Smith公式，以通过局部散射器在介绍量表上积累显微镜的无电荷。在此框架内，该模型允许我们量化电荷的微观动量松弛时间以及介质局部电荷的比例，除了电导率的直流电流极限外。我们表明，Drude-Smith模型在不同的Drude-Lorentz模型中是独一无二的，因为自由载体的松弛时间还决定了界电荷的共振的频率和阻尼。
The Drude-Smith model successfully describes the frequency and phase-resolved electrical conductivity data for a surprisingly broad range of systems, especially in the terahertz region. Still, its interpretation is unclear since its original derivation is flawed. We use an intuitive physical framework to derive the Drude-Smith formula for systems where microscopically free charges are accumulated on a mesoscopic scale by localized scatterers. Within this framework, the model allows us to quantify the microscopic momentum relaxation time of the charges and the fraction of mesoscopically localized charges in addition to the direct current limit of the conductivity. We show that the Drude-Smith model is unique among different Drude-Lorentz models because the relaxation time of the free carriers also determines the frequency and damping of the resonance of the bound charges.
