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Communication: Nucleation of quantized vortex rings in 4
9. N. B. Brauer, S. Smolarek, E. Loginov, D. Mateo, A. Hernando, M. Pi, M. Barranco, W. J. Buma, and M. Drabbels, Phys. Rev. Lett. 111, 153002 (2013).
19. R. J. Donnelly, Quantized Vortices in Helium II, Cambridge Studies in Low Temperature Physics (Cambridge University Press, Cambridge, 1991), Vol. 3.
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Whereas most of the phenomena associated with superfluidity have been observed in finite-size helium systems, the nucleation of quantized vortices has proven elusive. Here we show using time-dependent density functional simulations that the solvation of a Ba+ ion created by photoionization of neutral Ba at the surface of a 4He nanodroplet leads to the nucleation of a quantized ring vortex. The vortex is nucleated on a 10 ps timescale at the equator of a solid-like solvation structure that forms around the Ba+ ion. The process is expected to be quite general and very efficient under standard experimental conditions.
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