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dc.contributor.authorEscartín, José Maríaen
dc.contributor.authorAncilotto, Francescoen
dc.contributor.authorBarranco, Manuelen
dc.contributor.authorPi, Martíen
dc.date.accessioned2019-04-26T23:30:54Z
dc.date.available2019-04-26T23:30:54Z
dc.identifier.issn2469-9950
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/292055
dc.description.abstractWe have studied the merging of two identical ⁴He droplets at zero temperature, caused by their van der Waals mutual attraction. During the early stages of the merging, density structures appear which closely match the experimental observations by Vicente et al. [J. Low Temp. Phys. 121, 627 (2000)]. When the droplets are merging, quantized vortex-antivortex ring pairs nucleate at the surface and annihilate inside the merged droplet producing a roton burst. We also observe the nucleation of quantized vortex-antivortex rings that wrap the droplet surface and remain localized on the surface until they eventually decay into short-wavelength surface waves. Analysis of the kinetic energy spectrum discloses the existence of a regime where turbulence caused by vortex interaction and annihilation is characterized by a Kolmogorov power law. This is followed by another regime where roton radiation—produced by vortex-antivortex annihilation—dominates, whose hallmark is a weak, turbulent surface dynamics. We suggest that similar processes might appear in superfluid helium droplets after they capture impurities or if they are produced by hydrodynamic instability of a liquid jet. Experiments on collisions between recently discovered self-bound Bose-Einstein condensates should display a similar phenomenology.
dc.languageenen
dc.publisherAmerican Physical Society (APS)
dc.rightsAll rights reserved
dc.rights.uri
dc.titleVorticity and quantum turbulence in the merging of superfluid helium nanodropletsen
dc.typeArticle
prism.issueIdentifier14en
prism.number140505en
prism.publicationNamePhysical Review Ben
prism.volume99en
dc.identifier.doi10.17863/CAM.39208
dcterms.dateAccepted2019-04-01en
rioxxterms.versionofrecord10.1103/physrevb.99.140505en
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2019-04-01en
dc.identifier.eissn2469-9969
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEPSRC (EP/P034616/1)
cam.issuedOnline2019-04-16en


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