Angular momentum in rotating superfluid droplets
Abstract
The angular momentum of rotating superfluid droplets originates from quantized vortices and capillary waves, the interplay between which remains to be uncovered. Here, the rotation of isolated sub-micrometer superfluid 4He droplets is studied by ultrafast x-ray diffraction using a free electron laser. The diffraction patterns provide simultaneous access to the morphology of the droplets and the vortex arrays they host. In capsule-shaped droplets, vortices form a distorted triangular lattice, whereas they arrange along elliptical contours in ellipsoidal droplets. The combined action of vortices and capillary waves results in droplet shapes close to those of classical droplets rotating with the same angular velocity. The findings are corroborated by density functional theory calculations describing the velocity fields and shape deformations of a rotating superfluid cylinder.
Cite
@article{arxiv.1910.12926,
title = {Angular momentum in rotating superfluid droplets},
author = {Sean M. O. OConnell and Rico Mayro P. Tanyag and Deepak Verma and Charles Bernando and Weiwu Pang and Camila Bacellar and Catherine A. Saladrigas and Johannes Mahl and Benjamin W. Toulson and Yoshiaki Kumagai and Peter Walter and Francesco Ancilotto and Manuel Barranco and Marti Pi and Christoph Bostedt and Oliver Gessner and Andrey F. Vilesov},
journal= {arXiv preprint arXiv:1910.12926},
year = {2020}
}
Comments
submitted to Physical Review Letters