Excitable wave patterns in temporal systems with two long delays and their observation in a semiconductor laser experiment
Anno: 2019
Autori: Marino F., Giacomelli G.
Affiliazione autori: CNR, Ist Nazl Ott, Largo E Fermi 6, I-50125 Florence, Italy; CNR, Ist Sistemi Complessi, Via Madonna Piano 10, I-50019 Fiorentino, Italy.
Abstract: Excitable waves arise in many spatially extended systems of either a biological, chemical, or physical nature due to the interplay between local reaction and diffusion processes. Here we demonstrate that similar phenomena are encoded in the time dynamics of an excitable system with two, hierarchically long delays. The transition from 1D localized structures to curved wave segments is experimentally observed in an excitable semiconductor laser with two feedback loops and reproduced by numerical simulations of a prototypical model. While closely related to those found in 2D excitable media, wave patterns in delayed systems exhibit unobserved features originating from causality related constraints. An appropriate dynamical representation of the data uncovers these phenomena and permits us to interpret them as the result of an effective 2D advection-reaction-diffusion process.
Giornale/Rivista: PHYSICAL REVIEW LETTERS
Volume: 122 (17) Da Pagina: 174102-1 A: 174102-6
Parole chiavi: Time-delayed systems, pattern formation, semiconductor laser dynamicsDOI: 10.1103/PhysRevLett.122.174102Citazioni: 12dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-09-29Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui