Control of noise-induced coherent behaviors in an array of excitable elements by time-delayed feedback.
We investigate feedback-controlled coherent dynamics in a two-dimensional array of excitable elements. We demonstrate that one can freely enhance or reduce the spatiotemporal coherence of noise-induced oscillation, such as coherence resonance and phase synchronization, by controlling both the delay time and the feedback gain. Furthermore, we find that noise-induced oscillations are entrained by the feedback force in a certain range of the delay time. Experimental observations are approximately reproduced in a numerical simulation with a forced Oregonator model.
Okano
Taiji
T
Department of Applied Physics, Fukuoka University, Fukuoka 814-0180, Japan.
Miyakawa
Kenji
K