#Synthetic dimensions enable a new way to construct higher-order topological insulators
“#Synthetic dimensions enable a new way to construct higher-order topological insulators” a, An array of coupled ring resonators (green), each with an embedded electro-optic modulator (orange). b, The corresponding lattice in real and synthetic dimensions, x and frequency, respectively. The lattice shows higher-order topological behavior, such as the existence of corner modes. (c), Real-space structure…