| 研究課題/領域番号 |
20K14376
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| 研究種目 |
若手研究
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| 配分区分 | 基金 |
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| 審査区分 |
小区分13010:数理物理および物性基礎関連
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| 研究機関 | 慶應義塾大学 |
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研究代表者 |
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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| 研究期間 (年度) |
2020-04-01 – 2025-03-31
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| 研究課題ステータス |
交付 (2023年度)
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| 配分額 *注記 |
2,990千円 (直接経費: 2,300千円、間接経費: 690千円)
2023年度: 650千円 (直接経費: 500千円、間接経費: 150千円)
2022年度: 520千円 (直接経費: 400千円、間接経費: 120千円)
2021年度: 650千円 (直接経費: 500千円、間接経費: 150千円)
2020年度: 1,170千円 (直接経費: 900千円、間接経費: 270千円)
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| キーワード | 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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| 研究開始時の研究の概要 |
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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| 研究実績の概要 |
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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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
I was able to write two papers in this fiscal years.
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| 今後の研究の推進方策 |
I will study possible realizations in realistic experimental setting of ultracold atomic gases.
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