| Project/Area Number |
12640357
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体物性Ⅱ(磁性・金属・低温)
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| Research Institution | Osaka City University |
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Principal Investigator |
TSUBOTA Makoto Osaka City University, Graduate School, Department of Physics, Associate Professor, 大学院・理学研究科, 助教授 (10197759)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | Superfluid helium / Quantized vortex / Superfluid turbulence / Bose-Einstein condensation / Gross-Pitaevskii equation / Kolmogorov law / 渦格子 / コルモゴロフ則 / 中性原子気体 / カスケード過程 / 再結合 / 渦糸近似 |
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| Research Abstract |
We studied theoretically and numerically the vortex dynamics in superfluid helium and Bose-Einsteincondensate of Alkali atomic gas. The obtained results are the following.
Superfluid helium : We studied the energy spectrum of superfluid turbulent state, thus finding the Kolmogorov -5/3 law which is the most important statistical law in classical turbulence. The diffusion of a vortex tangle is studied. The vortex tangle under rotation was found to be polarized along the rotational axis.
Alkali atomic Bose-Einstein condensate : By studying numerically the Gross-Pitaevskii equation under rotation, we found that the condensate undergoes elliptic deformation, followed by unstable surface-mode excitations before forming a quantized vortex lattice; the results are qualitatively consistent with the experimental results.
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