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Measurements of Superfluid 4He Flow Through Sub-15 nm Aperture Arrays
We have constructed an experiment designed to study Josephson phenomena in 4He. Motivated by reports and our ideas for novel silicon nanofabrication techniques, we designed the experiment to study the...
We have constructed an experiment designed to study Josephson phenomena in 4He. Motivated by reports and our ideas for novel silicon nanofabrication techniques, we designed the experiment to study the...
Calibration Technique for Superfluid 4He Weak-Link Cells Based on the Fountain Effect
Studies of superfluid 4He weak-links require calibration constants which permit the determination of the pressure and temperature differences which drive Josephson oscillations. We describe a techniqu...
Studies of superfluid 4He weak-links require calibration constants which permit the determination of the pressure and temperature differences which drive Josephson oscillations. We describe a techniqu...
A Chemical Potential “Battery” for Superfluid 4He Weak Links
AIP Conf. Proc. -- September 7, 2006 -- Volume 850, pp. 117-118
LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24;
doi:10.1063/1.2354630
Issue Date: 7 September 2006
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E. Hoskinson,* Y. Sato,* K. Penanen,![[dagger]](http://scitation.aip.org/stockgif3/dagger-script.gif)
and R. E. Packard*
*Department of Physics, University of California, Berkeley, CA 94720
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109
and R. E. Packard**Department of Physics, University of California, Berkeley, CA 94720
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109
Research and development of superfluid weak links has been hindered by the absence of a source of dc chemical potential, similar to a simple battery or voltage source for analogous superconducting devices. We describe here a method for generating a dc chemical potential difference, 
µ across a weak link array in superfluid 4He. The presence of a µ forces quantum oscillations at a Josephson frequency, selectable by the adjustment of input power to a heater. We discuss a case in which the frequency locks onto a resonance feature where it exhibits remarkable stability, and amplitude magnification by a factor of 40. ©2006 American Institute of Physics
µ across a weak link array in superfluid 4He. The presence of a µ forces quantum oscillations at a Josephson frequency, selectable by the adjustment of input power to a heater. We discuss a case in which the frequency locks onto a resonance feature where it exhibits remarkable stability, and amplitude magnification by a factor of 40. ©2006 American Institute of Physics
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