论文标题
中心矩形光子晶格的拓扑相变
Topological phase transition of the centered rectangular photonic lattice
论文作者
论文摘要
探索了在狄拉克锥中出现在布里渊区边界的高对称点，探索了包括镜子反射对称性的CM平面光子材料（二维）。通过在光子晶体（PC）上实现特定的扰动，拓扑转换可以分别在琐碎的PC（普通绝缘子）和包括零和非零旋转Chern数（CS）的拓扑绝缘子之间建立桥梁。可以通过围绕非零角到其初始位置的CM光子晶体旋转来实现扰动。因此，打破晶胞的镜像对称会导致晶格的对称平面的不匹配。这种修饰导致定向带隙和带逆，这是拓扑转换的标志。提到的PC适合检查拓扑界面处的光的单向运输。
A Cm planar photonic material (two-dimensional) including the mirror reflection symmetry is explored where in the Dirac cones appeared at the high-symmetry points of the Brillouin zone boundary. By implementing the specific perturbation on the photonic crystal (PC), topological transition can make a bridge between the trivial PC (ordinary insulator) and the topological insulator including zero and non-zero spin Chern number (Cs), respectively. The perturbation can be realized through the rotation of the Cm photonic crystal around the nonzero angle to its initial position. Therefore, breaking the mirror symmetry of the unit cell leads to mismatch of the symmetry planes of the lattice. This modification results in the directional band gap & band inversion which is the signature of the topological transitions. The mentioned PC would be suitable for examination of the unidirectional transport of light at the topological interfaces.
