| 研究課題/領域番号 |
21J10521
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| 研究種目 |
特別研究員奨励費
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| 配分区分 | 補助金 |
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| 応募区分 | 国内 |
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| 審査区分 |
小区分13020:半導体、光物性および原子物理関連
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| 研究機関 | 沖縄科学技術大学院大学 |
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研究代表者 |
Keller Tim 沖縄科学技術大学院大学, 科学技術研究科, 特別研究員(DC2)
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| 研究期間 (年度) |
2021-04-28 – 2023-03-31
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| 研究課題ステータス |
完了 (2022年度)
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| 配分額 *注記 |
900千円 (直接経費: 900千円)
2022年度: 400千円 (直接経費: 400千円)
2021年度: 500千円 (直接経費: 500千円)
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| キーワード | Ultracold gases / Strongly correlated / One-dimensional mixture / Quantum phase transition / Bose-Einstein condensate / Critical metrology |
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| 研究開始時の研究の概要 |
My research is about the study of quantum systems comprised of interacting cold atoms from the perspective of thermodynamics. In particular, I aim to perform extensive numerical simulations of complex composite quantum systems to show how their interactions can be used for their precise control either directly via the system parameters or indirectly by coupling them to an open environment.
Gaining such control allows to employ these systems as working media in quantum heat engines in order to study peculiar effects like quantum supremacy in the newly emerging field of quantum thermodynamics.
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| 研究実績の概要 |
The work on the self-pinning transition for a two component quasi-one-dimensional quantum gas was extended to the case of finite intra-species repulsion for the component immersed into the Bose-Einstein condensate (BEC), going beyond the previously studied Tonks-Girardeau limit of infinite intra-species interaction. If the finite repulsion is weak compared to the inter-species interaction with the BEC, the immersed component can persist in a coherent superfluid state. Extensive simulations of the numerically amenable case of two and three immersed atoms were used to calculate the phase diagram of the system. The superfluid and self-pinned phases are connected via a first-order phase transition that is also captured by the effective analytical model developed previously. The model predicts the transition to coincide with the two-component miscibility criterion in the limit of large particle numbers in the immersed component.
The results are described in a preprint on arXiv in collaboration with Dr. Thomas Fogarty and Prof. Thomas Busch that has been accepted for publication in SciPost Physics.
During FY 2022 I also presented posters at the domestic conference "Ultracold Atoms Japan" in Okinawa in April 2022 as well as at the international conference "FINESS" in St. Martin, Germany, in May 2022.
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| 現在までの達成度 (段落) |
令和4年度が最終年度であるため、記入しない。
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| 今後の研究の推進方策 |
令和4年度が最終年度であるため、記入しない。
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