Figure 1From: Topological zero-dimensional photonic modes in chiral coupled-cavity arrays 1D chain of cavities coupled with complex NN hopping strengths. The arrows denote the sign of the phase factor of the (complex) hopping strengths. Due to the dissimilar (opposite) phases in the hopping strengths between a cavity and its left/right first neighbours, the unit cell contains a ’diatomic’ basis of length a.Back to article page