2 problems

Let a two-dimensional photonic crystal have a boundary and bulk band gaps. In each bulk band gap, consider the left- and right-moving boundary modes, and let the bulk Chern number…

A photonic system is described by a Hamiltonian $H$ with local gap $\mu_{(x,y,\omega)}^{\textrm{C}}$ at position $(x,y)$ and frequency $\omega$. Let $\delta H$ be a perturbation, a…