Ions Trapped below the Surface of Superfluid Helium

Vinen, W. F.

doi:10.1007/978-1-4684-5937-1_56

Cited by 3 publications

(1 citation statement)

References 16 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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Electrons at the Surface of Quantum Systems

Leiderer¹

1991

Excitations in Two-Dimensional and Three-Dimensional Quantum Fluids

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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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Ions Trapped below the Surface of Superfluid Helium

Cited by 3 publications

References 16 publications

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

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

Electrons at the Surface of Quantum Systems

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

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