We study solitary wave states of self-propelled particles in the Ising-type Vicsek model. A strongly localized state appears after the rapid direction change of collective motion in the one-dimensional Ising-type Vicsek model. It is shown that this phenomenon occurs by the nucleation of a small population moving in the opposite direction and the subsequent sweeping-up process. This formation mechanism of the solitary wave state is different from the motility-induced phase separation. The solitary wave states maintained by stochastic direction changes also appear on triangular and square lattices in two dimensions.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)