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Phys. Rev. Lett. 81, 1247–1250 (1998)

dc Supercurrents from Resonant Mixing of Josephson Oscillations in a 3He Weak Link

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R. W. Simmonds, A. Loshak, A. Marchenkov, S. Backhaus*, S. Pereversev†, S. Vitale‡, J. C. Davis, and R. E. Packard
Department of Physics, University of California, Berkeley, California 94720

Received 27 April 1998; published in the issue dated 10 August 1998

See accompanying Physics Focus

We have discovered that the dc mass current through a superfluid 3He weak link is substantially increased when the Josephson frequency matches the resonant frequency of a coupled mechanical oscillator. The phenomenon is the result of homodyne mixing between the Josephson oscillations and the oscillating pressure field associated with the resonant system. The measured sizes of the current enhancements are in excellent agreement with calculations based on this homodyne model. Similar observations in superconducting junctions, in which microwave radiation changes the dc electronic current, were used for the first confirmation of the dynamics of the superconducting Josephson effect.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.1247
DOI:
10.1103/PhysRevLett.81.1247
PACS:
67.57.-z, 74.50.+r

*Present address: Los Alamos National Laboratory, Los Alamos, NM.

†Present address: Physics Department, State University of New York at Stony Brook, Stony Brook, NY.

‡Permanent address: Department of Physics, University of Trento, Trento, Italy.

 
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