Onset of chaos in a superconducting Wheatstone bridge of overdamped Josephson junctions

M. Cahay; R. Kothari

doi:10.1103/PhysRevB.56.3394

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Onset of chaos in a superconducting Wheatstone bridge of overdamped Josephson junctions

M. Cahay, R. Kothari

DOI 10.1103/PhysRevB.56.3394 · Physical Review B

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Abstract

We identify a physical mechanism responsible for the onset of chaos in an asymmetric superconducting Wheatstone bridge of overdamped Josephson junctions while focusing on the dynamics of the transverse junction. The dynamics of the transverse junction are shown to be affected by an effective-noise-current term whose presence eventually leads to the onset of chaos in the bridge. This effective-noise-current term results from the competition of circulating currents in the upper and lower loops of the bridge. For some bridges, the effective-noise-current term has a profound influence on the value of the dc biasing current at which a nonzero average voltage appears across the transverse junction of the bridge.