Quantum Phase Slips in one-dimensional Josephson Junction Chains
Abstract
We have studied quantum phase-slip (QPS) phenomena in long one-dimensional Josephson junction series arrays with tunable Josephson coupling. These chains were fabricated with as many as 2888 junctions, where one sample had a tunable weak link in the middle. Measurements were made of the zero-bias resistance, , as well as current-voltage characteristics (IVC). The finite is explained by QPS and shows an exponential dependence on with a distinct change in the exponent at . When the IVC clearly shows a remnant of the Coulomb blockade, which evolves to a zero-current state with a sharp critical voltage as is tuned to a smaller value. The zero-current state below the critical voltage is due to coherent QPS and we show that these are enhanced at the central weak link. Above the critical voltage a negative differential resistance is observed which nearly restores the zero-current state.
Cite
@article{arxiv.1305.7157,
title = {Quantum Phase Slips in one-dimensional Josephson Junction Chains},
author = {Adem Ergül and Jack Lidmar and Jan Johansson and Yağız Azizoğlu and David Schaeffer and David B. Haviland},
journal= {arXiv preprint arXiv:1305.7157},
year = {2015}
}