Clustering Bifurcation and Spatiotemporal Intermittency in Rf-driven Josephson Junction Series Arrays

We study the spatiotemporal dynamics of the underdamped Josephson junction series arrays (JJSA) which are globally coupled through a resistive shunting load and driven by an rf bias current. Clustering bifurcations are shown to appear. In particular, cluster-doubling induced period-doubling bifurcations and clustering induced spatiotemporal chaos are found. Furthermore, an interesting spatiotemporal intermittency is also found. These phenomena are closely related to the dynamics of the single cell.