The Ion Crystal

Vinen, W. F.; Skrbek, L.

doi:10.1007/978-94-015-1286-2_17

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…Ott-Rowland et al, and Hannahs and Williams investigated plasma resonances of the 2D ion pool of snowballs [16][17][18]. Later on, Vinen's group in Birmingham had carried out the most vigorous investigations on the ion pools [3,[19][20][21][22]; mobility [23][24][25][26], plasmons [27], edge magnetoplasmons [28][29][30][31][32], novel oscillation modes of the Wigner solid [33][34][35][36][37][38][39][40], and so forth [41,42].…”

Section: Introductionmentioning

confidence: 99%

Snowball critical velocity to nucleate quantized vortex in isotopically pure 4He

Takahashi

Ikegami

Kono

2022

Preprint

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The critical velocity for vortex nucleation of snowball (positive ion) is determined experimentally in isotopically purified 4He at temperatures down to 50 mK. Systematic I-V characteristic measurements for the two-dimensional snowball pool at the depth of 37.6 nm from the surface are carried out with an extremely fine control of driving electric fields. The critical velocity of ∼ 32 ms-1 at 500 mK decreases with lowering temperature and approaches a temperature independent value of ∼ 18 ms-1 below 200 mK. The decrease of critical velocity corresponds to the increase of the nucleation rate. The temperature dependence of the critical velocity is qualitatively attributed to the "superohmic" macroscopic quantum tunnelling developed by Caldeira and Leggett. The reduction of the tunnelling rate by increasing temperature is an evidence for the quantum friction.

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Section: Introductionmentioning

confidence: 99%

Snowball critical velocity to nucleate quantized vortex in isotopically pure 4He

Takahashi

Ikegami

Kono

2022

Preprint

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“…This led to the first observation of the Wigner crystal in such a system involving the use of surface ripplons of known wavelengths to perform novel diffraction studies of the crystal structure [17]. These experiments included detailed investigations of the melting, plastic deformation and recrystallization of the Wigner crystal [18] and the discovery of a new class of magnetoplasmon, associated with propagating modes around the edge of the plasma [19]. Ladislav Skrbek, a senior research fellow, who made a major contribution to the success of this project, has now joined Russ Donnelly in Oregon and has contributed a paper to this Special Issue on superfluid-helium wind tunnels for aerodynamic research at very high Reynolds numbers.…”

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confidence: 99%

W F Vinen - a celebration

Gough

1999

J. Phys.: Condens. Matter

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On 29 May 1998, a group of present and past colleagues of Professor William Frank Vinen FRS, known to everyone as Joe, met in Birmingham University for a one-day meeting to mark his retirement from the Poynting Chair in the School of Physics and Astronomy. Although retired in a formal sense, as an Emeritus Professor, Joe continues his research on superfluid turbulence as actively as ever in a number of collaborations worldwide. A collection of papers presented by colleagues with whom he worked especially closely are presented in this Special Issue. They reflect the wide range of his achievements in fields as diverse as superfluid helium, superconductivity, quantum hydrodynamics, turbulence, light scattering and, most recently, the two-dimensional plasma and Wigner crystal formed by ions trapped just below the surface of superfluid helium.In addition to international recognition as one of the foremost physicists of his generation, Joe Vinen has had a major national influence on physics education at a number of levels. He has spent many years on behalf of the Royal Society and Institute of Physics addressing central issues of science and mathematics education and was largely responsible for the introduction of the four-year physics degree, which is now the norm for a professional physicist. Joe will also be remembered for many other services to the physics community including his chairmanship of the Physics Panel for the last Research Assessment Exercise. Joe's reputation for selfless hard work and his adherence to the highest possible standards in every aspect of his professional and public life have been legendary.Joe Vinen was born in 1930, the son of a physics schoolmaster, which may have had something to do with his lifelong dedication to both physics and education. From Watford Grammar School he obtained an Exhibition to Clare College, Cambridge, though entry was delayed until 1950 by National Service spent with the RAF at the Headquarters of Flying

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Positive Ion Critical Velocity for Nucleation of Quantized Vortices in Isotopically Pure $$^4$$He

2023

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The critical velocity for the vortex nucleation of positive ions is determined experimentally in isotopically purified $$^4$$ 4 He at temperatures as low as 50 mK. Systematic IV characteristic measurements for a two-dimensional positive ion pool at a depth of 37.6 nm from the surface are carried out with extremely fine control of driving electric fields. The critical velocity of $${\sim }$$ ∼ 32 ms$$^{-1}$$ - 1 at 500 mK decreases with decrease in temperature and approaches a temperature-independent value of $${\sim }$$ ∼ 18 ms$$^{-1}$$ - 1 below 200 mK. The decrease in critical velocity corresponds to the increase in nucleation rate. The temperature dependence of critical velocity is qualitatively attributed to the “superohmic” macroscopic quantum tunneling of the Caldeira–Leggett theory. The reduction in tunneling rate with increase in temperature is evidence for quantum friction.

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The Ion Crystal

Cited by 4 publications

References 26 publications

Snowball critical velocity to nucleate quantized vortex in isotopically pure 4He

Snowball critical velocity to nucleate quantized vortex in isotopically pure 4He

W F Vinen - a celebration

Positive Ion Critical Velocity for Nucleation of Quantized Vortices in Isotopically Pure $$^4$$He

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