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Charge transport and Zener tunneling in small Josephson junctions with dissipation

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<mark>Journal publication date</mark>1/01/1996
<mark>Journal</mark>Physical Review B - Condensed Matter and Materials Physics
Issue number14
Number of pages7
Pages (from-to)10074-10080
Publication StatusPublished
<mark>Original language</mark>English


We have investigated a small-area Josephson tunnel junction in a superconducting quantum interference device (SQUID) geometry, biased through high-resistance thin-film leads. This configuration provides the necessary conditions for the observation of charging effects. The Josephson coupling energy (Formula presented) was varied by an external magnetic flux introduced into a SQUID loop. The current-voltage characteristics of the system were measured at low temperatures T∼80 mK and different values of (Formula presented). At a certain value of the current the Zener tunneling rate exceeds that of the dissipative relaxation and the system “jumps” from the lowest to higher Brillouin zones. This corresponds to a crossover on the I-V curve. The crossover current (Formula presented) was measured as a function of (Formula presented). Good agreement between our data and a theory of Zener tunneling with dissipation has been found.