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Stationary Charge Imbalance Effect in System of Coupled Josephson Junction
We investigate stationary charge imbalance effect in the system of coupled
overdamped Josephson junctions. We show that coupling between junction and
nonzero stationary charge imbalance in the resistive state bring to a decrease
of the Josephson frequency in the Josephson junctions of the stack. The formed
difference in Josephson frequency leads to the nonuniform switch to the Shapiro
step regime in the presence of external electromagnetic radiation and
appearance of kinks of voltage on the IV-characteristics of the stack. We also
show that stationary charge imbalance brings to the slope of the Shapiro step
due to the difference of the charge imbalance potential on the edges of the
step. The theoretical and experimental results for voltage bias coupled
Josephson junctions have been compared with the current bias case
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