Bulletin of the American Physical Society
APS March Meeting 2023
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Q67: Hybrid Quantum Systems III
3:00 PM–6:00 PM,
Wednesday, March 8, 2023
Room: Room 412
Sponsoring Unit: DQI
Chair: Yogesh Patil, Yale University
Abstract: Q67.00010 : Characterization of magnetically levitated drops of liquid 3He and 4He*
4:48 PM–5:24 PM
Jack G Harris
Jack G Harris
Charles D Brown
(University of California Berkeley)
(University of Queensland)
Mehmet Tuna Uysal
Theophilus L Human
In practice, the scientific questions that can be addressed by an isolated helium drop depend on its size, temperature, lifetime, isotopic composition, and on the experimental probes that can be applied to it.
In this talk, I will describe experiments with millimeter-scale drops of pure 4He and pure 3He that are trapped by diamagnetic levitation in high vacuum. We have measured the drops’ temperature, heat load, and evaporation rate, as well as their surface waves and center-of-mass motion. We have also measured the medium-finesse optical whispering gallery modes in the drops, and placed upper limits on their optical absorption. These results are in good agreement with theoretical predictions. We find that superfluid 4He drops can be trapped indefinitely with a temperature ~ 330 mK. Drops of 3He are expected to reach lower temperatures, but their levitation is complicated by the dynamics of their nuclear spins.
*We acknowledge support from ONR Grant N00014-18-1-2409, and Vannevar Bush Faculty Fellowship N00014-20-1-2628. This material is based upon work supported by the NSF Graduate Research Fellowship under Grant No. DGE-1122492 and by a Ford Foundation Dissertation Fellowship.
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