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Observation of the Josephson plasma mode for a superfluid $^3$He weak link

A. Marchenkov·R. W. Simmonds·A. Loshak·J. C. Davis·R. E. Packard
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Abstract

The quantum phase difference across a superfluid Josephson-like weak link may exhibit periodic motion describable by a nonlinear equation identical to that of a rigid pendulum. We have directly observed this mode and find that the phase oscillation frequency decreases toward zero as the phase amplitude increases toward $π$. We also find that the low amplitude frequency is a direct measure of the weak link's critical current in quantitative agreement with theory.

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A. Marchenkov, R. W. Simmonds, A. Loshak, J. C. Davis, R. E. Packard. 1999-10-07. Observation of the Josephson plasma mode for a superfluid $^3$He weak link. https://doi.org/10.1103/physrevb.61.4196

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