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arXiv · 2204.05619

Measurements of Phase Dynamics in Planar Josephson Junctions and SQUIDs

D. Z. Haxell·E. Cheah·F. Křížek·R. Schott·M. F. Ritter·M. Hinderling·W. Belzig·C. Bruder·W. Wegscheider·H. Riel·F. Nichele
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Abstract

We experimentally investigate the stochastic phase dynamics of planar Josephson junctions (JJs) and superconducting quantum interference devices (SQUIDs) defined in epitaxial InAs/Al heterostructures, and characterized by a large ratio of Josephson energy to charging energy. We observe a crossover from a regime of macroscopic quantum tunneling to one of phase diffusion as a function of temperature, where the transition temperature $T^{*}$ is gate-tunable. The switching probability distributions are shown to be consistent with a small shunt capacitance and moderate damping, resulting in a switching current which is a small fraction of the critical current. Phase locking between two JJs leads to a difference in switching current between that of a JJ measured in isolation and that of the same JJ measured in an asymmetric SQUID loop. In the case of the loop, $T^*$ is also tuned by a magnetic flux.

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D. Z. Haxell, E. Cheah, F. Křížek, R. Schott, M. F. Ritter, M. Hinderling, W. Belzig, C. Bruder, W. Wegscheider, H. Riel, F. Nichele. 2022-04-12. Measurements of Phase Dynamics in Planar Josephson Junctions and SQUIDs. https://doi.org/10.1103/physrevlett.130.087002

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