Generation of Large Vortex-Free Superfluid Helium Nanodroplets

Ulmer, Anatoli; Heilrath, Andrea; Senfftleben, Björn; O’Connell-Lopez, Sean M. O.; Kruse, Björn; Seiffert, Lennart; Kolatzki, Katharina; Langbehn, Bruno; Hoffmann, Andreas; Baumann, Thomas M.; Boll, Rebecca; Chatterley, Adam S.; De Fanis, Alberto; Erk, Benjamin; Erukala, Swetha; Feinberg, Alexandra J.; Fennel, Thomas; Grychtol, Patrik; Hartmann, Robert; Ilchen, Markus; Izquierdo, Manuel; Krebs, Bennet; Kuster, Markus; Mazza, Tommaso; Montaño, Jacobo; Noffz, Georg; Rivas, Daniel E.; Schlosser, Dieter; Seel, Fabian; Stapelfeldt, Henrik; Strüder, Lothar; Tiggesbäumker, Josef; Yousef, Hazem; Zabel, Michael; Ziołkowski, Pawel; Meyer, Michael; Ovcharenko, Yevheniy; Vilesov, Andrey F.; Möller, Thomas; Rupp, Daniela; Tanyag, Rico Mayro P.

doi:10.1103/physrevlett.131.076002

Cited by 4 publications

(3 citation statements)

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“…At variance, we have found that, independently of their size, the 4 He equilibrium configurations hosting capillary waves alone lay on a line in the scaled angular momentum and angular velocity plane [11], disclosing a de facto nearly universal behavior. Let us mention that it has recently been found [38] that, under appropriate experimental conditions, moderately deformed vortex-free 4 He drops prevail when the number of atoms is smaller than about 10 8 . This work is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Self-sustained deformable rotating liquid He cylinders: The pure normal fluid He3 and superfluid He4 cases

Pi,

Ancilotto,

Barranco

et al. 2023

Phys. Rev. B

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Within density functional theory, we have studied self-sustained, deformable, rotating liquid He cylinders subject to planar deformations. In the normal fluid 3 He case, the kinetic energy has been incorporated in a semiclassical Thomas-Fermi approximation. In the 4 He case, our approach takes into account its superfluid character. For this study, we have chosen to limit our investigation to vortex-free configurations where angular momentum is exclusively stored in capillary waves on a deformed cross-section cylinder. Only planar deformations leading to noncircular cross sections have been considered, as they aim to represent the cross section of the very large deformed He drops discussed in the experiments. Axisymmetric Rayleigh instabilities, always present in fluid columns, have been set aside. The calculations allow us to carry out a comparison between the rotational behavior of a normal, rotational fluid ( 3 He) and a superfluid, irrotational fluid ( 4 He).

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Section: Introductionmentioning

confidence: 99%

Self-sustained deformable rotating liquid He cylinders: The pure normal fluid He3 and superfluid He4 cases

Pi,

Ancilotto,

Barranco

et al. 2023

Phys. Rev. B

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“…Any “alien” particle (from the simplest ones, an electron and helium ions, to nanoclusters and microparticles) can be captured in quantum vortices due to Bernoulli pressure gradient in rotating superfluid 14 . Therefore, quantum vortices promote the aggregation of impurity particles into linear structures, along the vortex cores, in bulk 15 and nanodroplets 16 of superfluid helium-4. Motion of particles in superfluid helium can be governed by external magnetic or electric fields 17 , thermal counterflow 18 , 19 , interaction with quantum vortices 20 , 21 .…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional Brownian motion of active particle on superfluid helium surface

Boltnev,

Vasiliev,

Petrov

2023

Sci Rep

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We report an experimental study of the 2D dynamics of active particles driven by quantum vortices on the free surface of superfluid helium at T = 1.45 К. The particle motion at short times (< 25 ms) relates to anomalous diffusion mode typical for active particles, while for longer times it corresponds to normal diffusion mode. The values of the rotational and translational kinetic energies of the particle allow to determine for the first time the intensity of the particle-vortex interaction and the dissipation rate of the vortex bundle energy. Strong bonding between a particle and a vortex is explained by coupling of normal and superfluid components.

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“…However, if there are vortices inside these nanodroplets, this can hinder the assembly of some of these nanostructures. Now Anatoli Ulmer from the Technical University of Berlin and colleagues have developed a method for generating vortex-free helium nanodroplets with 1000 times more helium atoms than previously possible [1]. The advance could enable researchers to study the self-assembly of a larger range of molecules.…”

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confidence: 99%