Charge oscillations and Zener noise due to interband transitions in small junctions

We discuss charge oscillation both in Josephson junctions and in normal tunnel junctions taking an approach close to that of Ben-Jacob and Gefen. We discuss interband transitions due to Zener tunneling within the framework of a master equation approach. We show that the Zener tunneling leads to a new type of noise that has long time correlations and that does not satisfy the fluctuation-dissipation relations. We give a summary and point out possible experimental verification of our predictions and discuss the effect of quasi-particle tunneling on charge oscillations in Josephson junctions. (orig./BUD)