| Project/Area Number |
20K14376
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 13010:Mathematical physics and fundamental theory of condensed matter physics-related
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| Research Institution | Keio University |
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Principal Investigator |
エドモンズ マシュー 慶應義塾大学, 自然科学研究教育センター(日吉), 訪問研究員 (00865230)
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| Project Period (FY) |
2020-04-01 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Keywords | ultracold Bose gases / dark solitons / dark quantum droplets / Zakharov-Shabat soliton / quantum vacuum energy / BEC / ultracold atomic gases / vortices / gauge fields / ultracold atoms / Vortices / Bose-Einstein condensate / Superfluidity / Impurities / Atomtronics |
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| Outline of Research at the Start |
Fluids in everyday life are viscous - there is some resistance to their flow. However the world of atoms is quite different, as they can move without resistance - a property called superfluidity. This research aims to understand superfluids interacting with small numbers of extra impurity atoms.
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| Outline of Annual Research Achievements |
Quantum liquid states of matter have been realized in experiments with ultracold Bose gases. We identify the criteria for the existence of dark solitons in beyond-mean-field binary condensates, revealing how these excitations exist for both repulsive and attractive interactions, the latter leading to dark quantum droplets with properties intermediate between a dark soliton and quantum droplet. The phenomenology of these excitations is explored within the full parameter space of the model, revealing a spatial profile of the excitation that differs from the Zakharov-Shabat soliton, leading to a negative effective mass enhanced in the presence of the quantum fluctuations. The dynamics of pairs of excitations shows nonintegrable dynamics and dark soliton bound states in the attractive regime.
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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
I was able to write two papers in this fiscal years.
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| Strategy for Future Research Activity |
I will study possible realizations in realistic experimental setting of ultracold atomic gases.
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