Fig. 7: The temporal evolution of the response function.

a The schematic diagram of the loop integral in the lower half plane of the complex plane. The cyan dots represent the poles, which are situated at a considerable distance from the integral path. The red and yellow paths represent the integral paths along the real axis and the semicircular arc, respectively. The R₀ and R represent the center and radius of the semicircular contour of the integral, respectively. b Temporal evolutions of coefficients \(|{C}_{{s}_{0}}|\) and \(|{C}_{s}|\) with subplot of the energy spectrum of the tight-binding model. The gray zone in the subplot represents the gap.