INTRINSIC MECHANISM OF PHASE-LOCKING IN 2-DIMENSIONAL JOSEPHSON-JUNCTION NETWORKS IN PRESENCE OF AN EXTERNAL MAGNETIC-FIELD

We present numerical simulations of the dynamics of two-dimensional Jo sephson junction arrays to study the mechanism of mutual phase locking . We show that in the presence of an external magnetic field two mecha nisms are playing a role in phase locking: feedback through the extern al load and internal coupling between rows due to microwave currents i nduced by the field. We have found the parameter values (junction capa citance, cell loop inductance, impedance of the external load) for whi ch the interplay of both these mechanisms leads to the in-phase soluti on. The case of unloaded arrays is discussed as well. (C) 1997 America n Institute of Physics.