Dr. Mathieu Gibert
Université Grenoble Alpes, Institut Néel, CNRS UPR2940
website
Direct visualisation of the quantum vortex lattice structure, oscillations, and destabilisation in rotating 4He
C. Peretti, F. Lorin, C. Bourjaillat, J. Vessaire, É. Durozoy, and M. Gibert
Quantum vortices constitute a fundamental component of superfluid dynamics and are pivotal in elucidating energy dissipation mechanisms within these systems. This research demonstrates our capacity to visualize these vortices in the canonical and higher-symmetry case of a stationary rotating superfluid bucket. We rigorously validate Feynman’s rule through direct visualization, establishing a correlation between the resulting quantum vortex density and the applied rotational velocity. We make the most of this stable configuration by implementing an alternative heat flux aligned with the axis of rotation. Observations at moderate amplitudes reveal the emergence of collective wave modes propagating along the vortices, while higher amplitudes result in intricate quantum vortex interactions. By incrementally increasing the heat flux, this ensemble of regimes delineates a trajectory towards quantum turbulence in rotating helium-4, while also providing a foundation for refining the theoretical frameworks pertaining to all quantum fluids.
Peretti, C., Vessaire, J., Durozoy, É., & Gibert, M. (2023). “Direct visualization of the quantum vortex lattice structure, oscillations, and destabilization in rotating 4He”. Science Advances.
https://doi.org/10.1126/sciadv.adh2899
