Merging of superfluid Helium nanodroplets with vortices
Escartín Esteban, José María (Institut Català de Nanociència i Nanotecnologia)
Ancilotto, Francesco (Università di Padova. Dipartimento di Fisica e Astronomia "Galileo Galilei.)
Barranco, Manuel (Universitat de Barcelona. Departament de Física Quàntica i Astrofísica)
Pi, Marti (Universitat de Barcelona. Institut de Nanociència i Nanotecnologia)

Data:	2021
Resum:	Within Density Functional Theory, we have investigated the coalescence dynamics of two superfluid helium nanodroplets hosting vortex lines in different relative orientations, which are drawn towards each other by the Van der Waals mutual attraction. We have found a rich phenomenology depending on how the vortex lines are oriented. In particular, when a vortex and anti-vortex lines are present in the merging droplets, a dark soliton develops at the droplet contact region, which eventually decays into vortex rings. Reconnection events are observed between the vortex lines or rings, leading to the creation of more vortices. Our simulations show the interplay between vortex creation and reconnections, as well as the effect of the droplet surface which pins the vortex ends and, by reflecting short-wavelength excitations produced by the interactions between vortices, strongly affects the droplet final state. Additional vorticity is nucleated in the proximity of surface indentations produced in the course of the dynamics, which in turn interact with other vortices present in the droplets. These effects, obviously absent in the case of bulk liquid helium, show that the droplet surface may act as a multiplier of vortex reconnections. The analysis of the energy spectrum shows that vortex-antivortex ring annihilation, as well as vortex-antivortex reconnections, yields roton bursts of different intensity.
Ajuts:	European Commission 824143 Agencia Estatal de Investigación PID2020-114626GB-I00 Ministerio de Economía y Competitividad SEV-2017-0706
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Prepublicació ; recerca ; Versió de l'autor
Obra relacionada:	Escartín, José María ; Ancilotto, Francesco ; Barranco, Manuel and Pi, Martí. «Merging of superfluid helium nanodroplets with vortices». Physical review B, Vol. 105, number 2 (Jan. 2022), art. 024511 https://doi.org/10.1103/PhysRevB.105.024511

DOI: 10.48550/arXiv.2110.10612

16 p, 7.9 MB

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