物理
塞曼效应
哈密顿量(控制论)
卤化物
凝聚态物理
联轴节(管道)
法拉第效应
电磁场
磁场
自旋(空气动力学)
量子力学
材料科学
化学
热力学
数学优化
数学
无机化学
冶金
作者
Artem G. Volosniev,Abhishek Shiva Kumar,Dusan Lorenc,Younes Ashourishokri,Ayan A. Zhumekenov,Osman M. Bakr,Mikhail Lemeshko,Zhanybek Alpichshev
标识
DOI:10.1103/physrevlett.130.106901
摘要
Lead halide perovskites enjoy a number of remarkable optoelectronic properties. To explain their origin, it is necessary to study how electromagnetic fields interact with these systems. We address this problem here by studying two classical quantities: Faraday rotation and the complex refractive index in a paradigmatic perovskite CH_{3}NH_{3}PbBr_{3} in a broad wavelength range. We find that the minimal coupling of electromagnetic fields to the k·p Hamiltonian is insufficient to describe the observed data even on the qualitative level. To amend this, we demonstrate that there exists a relevant atomic-level coupling between electromagnetic fields and the spin degree of freedom. This spin-electric coupling allows for quantitative description of a number of previous as well as present experimental data. In particular, we use it here to show that the Faraday effect in lead halide perovskites is dominated by the Zeeman splitting of the energy levels and has a substantial beyond-Becquerel contribution. Finally, we present general symmetry-based phenomenological arguments that in the low-energy limit our effective model includes all basis coupling terms to the electromagnetic field in the linear order.
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