Nonlinear dynamics of intrinsic Josephson junctions under an applied current

Nonlinear dynamics of Josephson plasma oscillations in intrinsic Josephson junctions formed in high Tc superconductors is studied based on numerical simulations. The dynamics is described by a differential equation similar to sine-Gordon equation. We discuss within classical dynamics that the eigenmodes, well defined in linearized equation, are modified by the nonlinear effects. Especially we concentrate on the formation of the so-called “breather modes”, which gives rise to the mixing of eigenmodes.