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Thermally driven josephson oscillations in superfluid 4He.

E Hoskinson¹, R E Packard

¹Department of Physics, University of California, Berkeley, California 94720-7300, USA.

Physical Review Letters

|May 21, 2005

Summary

Temperature differences can create superfluid oscillations in helium-4 (4He). This study validates the Josephson frequency relation by measuring these oscillations near the superfluid transition temperature.

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Area of Science:

Low-temperature physics
Quantum fluid dynamics

Background:

Superfluidity in Helium-4 (4He) exhibits unique quantum phenomena.
Understanding the behavior of superfluids under external stimuli is crucial for quantum technologies.

Purpose of the Study:

To investigate the excitation of superfluid oscillations in 4He using a temperature differential.
To experimentally validate the Josephson frequency relation under specific conditions.

Main Methods:

Utilizing a heater to induce a time-dependent temperature differential across an array of 70 nm apertures.
Simultaneously measuring oscillation frequency, temperature differential, and pressure differential.

Main Results:

Demonstrated that a temperature differential can indeed drive superfluid oscillations in 4He.
Confirmed the validity of the most general form of the Josephson frequency relation.

Conclusions:

The Josephson frequency relation holds true for superfluid oscillations driven by thermal gradients.
These findings provide insights into the fundamental physics of superfluids near their critical temperature.

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