<i>Quantized Vortices in Helium II</i>

Donnelly, Russell J.; Hallock, R. B.

doi:10.1063/1.2809626

Cited by 367 publications

(465 citation statements)

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“…The attractive force, acting only in the immediate vicinity of the vortex core, is weak and leads to a binding energy of only 3-10 K (2-7 cm À1 ) for an atom. 2 However, at the temperature of a helium droplet (0.38 K 15 ) this is strong enough to pin atoms to the vortex.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, we cannot rule out the possibility that multiple vortices might form in some of the helium droplets. Vortex arrays are well-known in bulk superfluid helium 2 and are conceivable in helium droplets if the latter are formed with sufficient angular momentum. Multiple vortices would complicate particle aggregation by offering nucleation sites along different vortex lines within a droplet.…”

Section: Discussionmentioning

confidence: 99%

“…1,2 A method for visualizing the very narrow vortices, which have core diameters on the order of an Ångstrom, was developed in 2006. 3 By bubbling hydrogen highly diluted in helium gas through the liquid helium, condensed hydrogen particles with sizes on the order of microns were produced.…”

Section: Introductionmentioning

confidence: 99%

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Vortex-induced aggregation in superfluid helium droplets

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Latimer

Cheng

et al. 2014

Phys. Chem. Chem. Phys.

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The formation of Ag nanoparticles by the addition of Ag atoms to helium droplets has been investigated. The resulting nanoparticles were then imaged by transmission electron microscopy after being deposited on a thin solid surface. In large helium droplets chains of Ag nanorods were observed similar to recently reported track-like deposits [Gomez et al., Phys. Rev. Lett., 2012, 108, 155302]. However, by adjusting the experimental conditions chains of spherical nanoparticles could also be seen with a nearly uniform inter-particle spacing. Given that spherical Ag nanoparticles have no intrinsic anisotropy, the only viable explanation is that these particles must

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Vortex-induced aggregation in superfluid helium droplets

Spence

Latimer

Cheng

et al. 2014

Phys. Chem. Chem. Phys.

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“…Q uantized vortices are topological excitations occurring in a variety of quantum systems, such as Bose-Einstein condensates 1,2 , superfluids 3 and superconductors 4,5 . Understanding such excitations is therefore fundamental to the study of quantum phases and quantum phase transitions.…”

mentioning

confidence: 99%

Dissociation dynamics of singly charged vortices into half-quantum vortex pairs

et al. 2012

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The quest for identification and understanding of fractional vorticity is a major subject of research in the quantum fluids domain, ranging from superconductors, superfluid Helium-3 to cold atoms. In a two-dimensional Bose degenerate gas with a spin degree of freedom, the fundamental topological excitations are fractional vortical entities, called half-quantum vortices. Convincing evidence for the existence of half-quantum vortices was recently provided in spinor polariton condensates. The half-quantum vortices can be regarded as the fundamental structural components of singly charged vortices but, so far, no experimental evidence of this relation has been provided. Here we report on the direct and time-resolved observation of the dynamical process of the dissociation of a singly charged vortex into its primary components, a pair of half-quantum vortices. The physical origin of the observed phenomenology is found in a spatially inhomogeneous static potential that couples the two spin components of the condensate.

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“…As well as thermal waves, phonon hydrodynamics was first discovered in superfluid liquid helium [79][80][81][82]. Here we give a brief introduction to the problem of heat transport along thin tubes, which is in fact one of the most challenging topics in heat transfer [81,83,84].…”

Section: Thin Tubes Filled With Superfluid Heliummentioning

confidence: 99%