| Project/Area Number |
15340122
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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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, Professor, 大学院・理学研究科, 教授 (10197759)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥16,000,000 (Direct Cost: ¥16,000,000)
Fiscal Year 2005: ¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 2004: ¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 2003: ¥4,100,000 (Direct Cost: ¥4,100,000)
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| Keywords | superfluid helium / Bose-Einstein condensation / quantized vortex / quantum fluid dynamics / atomic gas / turbulence / superfluid turbulence / Kolmogorov law / ボースアインシュタイン凝縮 / 中性原子気体 / ボース凝縮 / 渦タングル / 渦格子 |
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| Research Abstract |
We study theoretically and numerically physics of quantized vortices in superfluid helium and atomic Bose-Einstein condensates. The obtained results are the following.
Superfluid helium
1.We discovered an velocity-independent transition for superfluid turbulence in superfluid helium3 at ultra low temperatures.
2.We found that the energy spectrum of superfluid turbulence obeys the Kolmogorov law which is the most important statistical law in classical turbulence.
3.We discovered the Kelvin wave cascade process at very low temperatures that is supposed to be a dissipative mechanism.
4.We found that a polarized vortex tangle appears in rotating superfluid turbulence.
Atomic Bose-Einstein condensation
1.We studied the structure of vortex lattices in rotating two-component Bose condensates.
2.We studied three-dimensional dynamics of vortex lattice formation in rotating Bose condensates.
3.We studied the mechanism of formation of multi domains in two-component Bose condensates.
4.We studied collective excitations in two-component hose condensates.
5.We studied spin texture in rotating two-component Bose condensates.
6.We studied the ground state in rotating mixture of Bosons and Fermions.
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