Josephson mass current dynamics in experiments and simulations within a new model concept

Josephson mass currents have been investigated in superfluid 3He-B with high temporal resolution. The experimentally observed dynamics of all DC and AC Josephson effects could be modeled in detail by solving the quantum-phase– controlled equations of motion which could be adjusted for other quantum condensates as well. We show that the 3He π-state, discussed in the literature, might not be a state of 3He but nonlinear dynamics which also dominates the apparent dissipation and oscillation in the Josephson device. Four different modes were identified for Cooper pair oscillations and a pure sinusoidal current phase relationship was found for temperatures down to 0.16 mK where the device can be used as a bolometric detector.