发表机构
Ioffe Institute（约费研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究提出导电圆盘晶格中泵浦诱导法拉第效应的理论机制，源于电子气三阶非线性响应，在等离激元共振下旋转角显著增强，可解释石墨烯圆盘晶格的巨法拉第旋转。
AI 中文摘要
我们提出了对二维导电圆盘晶格中泵浦诱导的法拉第和克尔旋转的理论研究。我们提出了一种法拉第和克尔响应的机制，其中圆偏振泵浦直接在探针频率下诱导电子电导率张量的高频霍尔分量σxy=-σyx。微观上，σxy源于电子气的三阶非线性响应，而非逆法拉第效应中螺线管电荷电流产生的真实磁场。我们表明，当泵浦和探针频率调谐到圆盘的等离激元共振附近时，法拉第和克尔旋转角显著增强，在太赫兹范围内达到每1 kW/cm²入射泵浦强度约0.1°。该机制可以解释最近在石墨烯圆盘晶格中观察到的巨泵浦诱导法拉第旋转。
英文摘要
We present a theoretical study of pump-induced Faraday and Kerr rotation in a two-dimensional lattice of conducting disks. We propose a mechanism of Faraday and Kerr responses in which a circularly polarized pump directly induces a high-frequency Hall component $σ_{xy}=-σ_{yx}$ of the electron conductivity tensor at the probe frequency. Microscopically, $σ_{xy}$ originates from the third-order nonlinear response of the electron gas rather than from the real magnetic field created by solenoidal charge currents in the inverse Faraday effect. We show that the Faraday and Kerr rotation angles are significantly enhanced when the pump and probe frequencies are tuned close to the plasmon resonance of the disks, reaching $\sim 0.1^\circ$ per 1~kW/cm$^2$ of incident pump intensity in the terahertz range. This mechanism can explain recently observed giant pump-induced Faraday rotation in graphene disk lattices.
Comments10 pages, 4 figures
