论文标题
通过抗铁磁波动扩大和锐化峰
Broadening and sharpening of the Drude peak through antiferromagnetic fluctuations
论文作者
论文摘要
抗铁磁或电荷密度波波动通过最近发现的π-TON对光导率的贡献，并且相当普遍构成了低维相关电子系统中的主要顶点校正。在这里，我们可以根据横向粒子孔通道中的半分析随机相位近似（RPA）梯子研究这些$π$ -TON的最简单版本。直接针对真实频率计算了光导率的顶点校正。我们验证RPA定性地重现了Hubbard模型中Drude峰的π-TON顶点校正。根据温度，我们发现顶点校正以扩大或锐化drude峰。
Antiferromagnetic or charge density wave fluctuations couple with light through the recently discovered π-ton contribution to the optical conductivity, and quite generically constitute the dominant vertex corrections in low-dimensional correlated electron systems. Here we study the arguably simplest version of these $π$-tons based on the semi-analytical random phase approximation (RPA) ladder in the transversal particle-hole channel. The vertex corrections to the optical conductivity are calculated directly for real frequencies. We validate that the RPA qualitatively reproduces the π-ton vertex corrections to the Drude peak in the Hubbard model. Depending on the temperature we find vertex corrections to broaden or sharpen the Drude peak.
