arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.08913physics.opticscond-mat.mes-hallphysics.comp-ph
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旋光光子晶体中陈数的第一性原理计算

First-principle calculation of Chern number in gyrotropic photonic crystals

Ran Zhao, Guo-Da Xie, Menglin L. N. Chen, Zhihao Lan, Zhixiang Huang, Wei E. I. Sha

摘要:

作为表征波函数量子化集体行为的重要品质因数,陈数是量子霍尔绝缘体的拓扑不变量。陈氏数还表征了光子拓扑绝缘体(PTIs)的拓扑性质,因此在PTIs设计中具有重要意义。本文从麦克斯韦方程组出发,发展了一种计算二维旋光光子晶体(PC)陈数的第一性原理方法。首先,我们用全波频域有限差分法(FDFD)求解由麦克斯韦方程组转化而来的厄米特广义本征值方程。然后通过计算第一布里渊区上的Berry曲率的积分得到了Chern数。通过对横电(TE)模和横磁(TM)模的数值算例,证明了该方法的有效性和准确性,在较粗的网格上可以得到收敛的陈数.

英文摘要:

As an important figure of merit for characterizing the quantized collective behaviors of the wavefunction, Chern number is the topological invariant of quantum Hall insulators. Chern number also identifies the topological properties of the photonic topological insulators (PTIs), thus it is of crucial importance in PTI design. In this paper, we develop a first principle computatioal method for the Chern number of 2D gyrotropic photonic crystals (PCs), starting from the Maxwell's equations. Firstly, we solve the Hermitian generalized eigenvalue equation reformulated from the Maxwell's equations by using the full-wave finite-difference frequency-domain (FDFD) method. Then the Chern number is obtained by calculating the integral of Berry curvature over the first Brillouin zone. Numerical examples of both transverse-electric (TE) and transverse-magnetic (TM) modes are demonstrated, where convergent Chern numbers can be obtained using rather coarse grids, thus validating the efficiency and accuracy of the proposed method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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