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Salomaa, M.M.; Volovik, G. E.

doi:10.1103/revmodphys.59.533

Cited by 610 publications

(486 citation statements)

References 140 publications

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“…For the Mermin-Ho (MH) [11] vortex the bending angle β must be π 2 at the boundary of the condensate and for the Anderson-Toulouse (AT) [17] vortex β must be π. For the MH vortex in liquid 3 He the boundary value is imposed by the walls of the container [18].…”

Section: Modelmentioning

confidence: 99%

Coreless vortex ground state of the rotating spinor condensate

2002

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We study the ground state of the rotating spinor condensate and show that for slow rotation the ground state of the ferromagnetic spinor condensate is a coreless vortex. While coreless vortex is not topologically stable, we show that there is an energetic threshold for the creation of a coreless vortex. This threshold corresponds to a critical rotation frequency that vanishes as the system size increases. Also, we demonstrate the dramatically different behavior of the spinor condensate with anti-ferromagnetic interactions. For anti-ferromagnetic spinor condensate the angular momentum as a function of rotation frequency exhibits the familiar discrete staircase behavior, but in contrast to an ordinary condensate the first step is to the state with angular momentum 1/2 per particle. 03.75.Fi, 32.80.Pj,

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Section: Modelmentioning

confidence: 99%

Coreless vortex ground state of the rotating spinor condensate

2002

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“…These internal quantum numbers imply a rich phase diagram of allowed vortex structures, including nonquantized vortices with continuous vorticity (see also Refs. [24,25]). …”

Section: Introductionmentioning

confidence: 99%

Vortices in a trapped dilute Bose-Einstein condensate

Fetter¹,

Svidzinsky²

2001

J. Phys.: Condens. Matter

553

758

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We review the theory of vortices in trapped dilute Bose-Einstein condensates and compare theoretical predictions with existing experiments. Mean-field theory based on the time-dependent Gross-Pitaevskii equation describes the main features of the vortex states, and its predictions agree well with available experimental results. We discuss various properties of a single vortex, including its structure, energy, dynamics, normal modes and stability, as well as vortex arrays. When the nonuniform condensate contains a vortex, the excitation spectrum includes unstable ("anomalous") mode(s) with negative frequency. Trap rotation shifts the normal-mode frequencies and can stabilize the vortex. We consider the effect of thermal quasiparticles on vortex normal modes as well as possible mechanisms for vortex dissipation. Vortex states in mixtures and spinor condensates are also discussed.

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“…In the particular case of Bose degenerate gases with spin degree of freedom, commonly known as spinor condensates, the fundamental topological excitations are more exotic vortical entities, called half-quantum vortices (HQVs) [18][19][20][21][22][23] . They can be conceived as the primary structural components of singly charged vortices (namely vortices with winding number ± 1).…”

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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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Quantized vortices in superfluidHe3

Cited by 610 publications

References 140 publications

Coreless vortex ground state of the rotating spinor condensate

Coreless vortex ground state of the rotating spinor condensate

Vortices in a trapped dilute Bose-Einstein condensate

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

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