## Characterization of Levitated Superfluid Helium Drops in High Vacuum

12 Sep 2021  ·  C. D. Brown, Y. Wang, M. Namazi, G. I. Harris, M. T. Uysal, J. G. E. Harris ·

We describe measurements of the thermal, mechanical, and optical properties of drops of superfluid $^4$He that are magnetically levitated in high vacuum. The drops have radius $\sim 200~\mu$m, cool by evaporation to temperatures $\sim 300$ mK, and can be trapped indefinitely in a background vapor pressure $\sim 10^{-8}$ mBar... Measurements of the drops' evaporation rate, normal modes of motion, and optical whispering gallery modes are found to agree with well-established models. read more

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