Phys. Rev. Lett. 87, 035301 (2001) [4 pages]Observation of the Superfluid Shapiro Effect in a 3He Weak LinkReceived 26 February 2001; published 26 June 2001 We have studied the mass currents through a superfluid 3He Josephson weak link in the presence of an externally applied ac pressure modulation. Characteristic changes in the dc mass currents are observed whenever the superfluid Josephson frequency ωJ is an integer multiple of the ac modulation frequency ω. The measured dependencies of these current changes on ac pressure amplitude are in excellent agreement with theory describing quantum phase dynamics of superfluid 3He weak links. These results establish the superfluid analog of the superconducting Shapiro effect. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.035301
DOI:
10.1103/PhysRevLett.87.035301
PACS:
67.57.De, 74.50.+r, 85.25.Cp
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