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Pinning of quantized vortices in helium drop by dopant atoms and molecules

Franco Dalfovo·Ricardo Mayol·Marti Pi·Manuel Barranco
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Abstract

Using a density functional method, we investigate the properties of liquid 4He droplets doped with atoms (Ne and Xe) and molecules (SF_6 and HCN). We consider the case of droplets having a quantized vortex pinned to the dopant. A liquid drop formula is proposed that accurately describes the total energy of the complex and allows one to extrapolate the density functional results to large N. For a given impurity, we find that the formation of a dopant+vortex+4He_N complex is energetically favored below a critical size N_cr. Our result support the possibility to observe quantized vortices in helium droplets by means of spectroscopic techniques.

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Franco Dalfovo, Ricardo Mayol, Marti Pi, Manuel Barranco. 2000-01-20. Pinning of quantized vortices in helium drop by dopant atoms and molecules. https://doi.org/10.1103/physrevlett.85.1028

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