Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.155302
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Funding
- NSF [CHE-1112391]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1112391] Funding Source: National Science Foundation
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We report on the observation of vortices in superfluid He-4 droplets produced in the expansion of liquid He. The vortices were traced by introducing Ag atoms, which clustered along the vortex lines, into the droplets. The Ag clusters were subsequently surface-deposited and imaged via electron microscopy. The prevalence of elongated track-shaped deposits shows that vortices are present in droplets larger than about 300 nm and that their lifetime exceeds a few milliseconds. We discuss the possible formation mechanisms and the stability of the vortices.
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