Noise-induced front motion: signature of a global bifurcation
We show that front motion can be induced by noise in a spatially extended excitable system with a global constraint. Our model system is a semiconductor superlattice exhibiting complex dynamics of electron accumulation and depletion fronts. The presence of noise induces a global change in the dynami...
Saved in:
| Published in | Physical review letters Vol. 96; no. 24; p. 244104 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
23.06.2006
|
| Online Access | Get more information |
Cover
Loading…
| Summary: | We show that front motion can be induced by noise in a spatially extended excitable system with a global constraint. Our model system is a semiconductor superlattice exhibiting complex dynamics of electron accumulation and depletion fronts. The presence of noise induces a global change in the dynamics of the system forcing stationary fronts to move through the entire device. We demonstrate the effect of coherence resonance in our model; i.e., there is an optimal level of noise at which the regularity of front motion is enhanced. Physical insight is provided by relating the space-time dynamics of the fronts with a phase-space analysis. |
|---|---|
| ISSN: | 0031-9007 1079-7114 |
| DOI: | 10.1103/physrevlett.96.244104 |