title: Collective motion of vibrated polar disks.
abstract: We experimentally study a monolayer of vibrated disks with a built-in polar asymmetry which enables them to move quasibalistically on a large persistence length. Alignment occurs during collisions as a result of self-propulsion and hard core repulsion. Varying the amplitude of the vibration, we observe the onset of large-scale collective motion and the existence of giant number fluctuations with a scaling exponent in agreement with the predicted theoretical value.
authors.affiliation: Service de Physique de l'Etat Condensé, CEA-Saclay, URA 2464 CNRS, 91191 Gif-sur-Yvette, France.
authors.forename: Julien
authors.initials: J
authors.lastname: Deseigne
authors.forename: Olivier
authors.initials: O
authors.lastname: Dauchot
authors.forename: Hugues
authors.initials: H
authors.lastname: Chaté