| Project/Area Number |
23K03292
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
NAIDON PASCAL 国立研究開発法人理化学研究所, 仁科加速器科学研究センター, 専任研究員 (70611979)
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| Project Period (FY) |
2023-04-01 – 2027-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2026: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2025: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2024: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| Keywords | Efimov physics / Resonance lifetime / Feshbach resonance / Quantum Defect Theory / polaron / ultracold atoms / Bose-Einstein condensate / Efimov effect |
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| Outline of Research at the Start |
This theoretical project aims at understanding the role of few-body effects (such as the Efimov attraction) in strongly-interacting Bose polarons (impurities strongly coupled to a Bose-Einstein condensate). The theoretical results can be compared with experiments with ultracold atoms.
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| Outline of Annual Research Achievements |
In this fiscal year, the role of the Efimov attraction in strongly interacting polarons was investigated by:
- treating the problem of 2 + 1 particles. The lifetime of three-body resonances in such systems was calculated numerically, revealing that specific mass ratios between the particles make the resonances long lived. These results were published in Few-Body Systems.
- analysing the quantum defect theory of two-body Feshbach resonances enabling the realisation of Efimov states. An important parameter was identified and proposed to be measured experimentally. A manuscript has been submitted.
- treating the problem of Efimov states with dipole interactions. The three-body parameter of these states was predicted analytically and numerically. A manuscript has been submitted.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The study of Efimov physics has progressed significantly, but the treatment of polarons as originally intended by the truncated basis method has not been fully implemented yet.
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| Strategy for Future Research Activity |
In the next fiscal year, the use of the truncated basis method will be fully implemented to further investigate the polaronic aspect of the physics.
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