Circular dichroism and Faraday and Kerr rotation in two-dimensional materials with intrinsic Hall conductivities
Circular dichroism and Faraday and Kerr rotation in two-dimensional materials with intrinsic Hall conductivities
复制标题
DOI：
10.1103/physrevb.101.045426
复制
发表时间：
2020-01
影响因子：
3.7
通讯作者：
F. R. Pratama;M. S. Ukhtary;R. Saito
中科院分区：
文献类型：
--
作者：
F. R. Pratama;M. S. Ukhtary;R. Saito
对于给定的自旋方向，二维六方材料的电子结构通常可以由Halfman模型来描述，该模型分别由于时间反转和反转对称性的破坏而显示圆二色性或谷极化。通过使用久保公式，我们计算纵向和横向（霍尔）的光学电导率，以获得吸收光谱。通过求解二维材料的具有边界条件的麦克斯韦方程组，计算了圆偏振光的吸收光谱。我们发现，圆二色性和谷偏振依赖于霍尔电导率的虚部的性质，而霍尔电导率的真实的部分产生大的法拉第和克尔旋转高达几度。
The electronic structures of two-dimensional hexagonal materials for a given spin direction can be generally written by the Haldane model, which shows circular dichroism or valley polarization due to broken time-reversal and inversion symmetries, respectively. By using the Kubo formula, we calculate longitudinal and transversal (Hall) optical conductivities to obtain the absorption spectra. The absorption spectra for circularly polarized lights are calculated by solving the Maxwell equations with a boundary conditions at the two-dimensional material. We found that circular dichroism and valley polarization depend on the properties of the imaginary part of the Hall conductivity, while the real part of the Hall conductivity generates large Faraday and Kerr rotations up to a few degrees.