2023 Fiscal Year Research-status Report
Quantum vortex dynamics in exotic superfluid systems
| Project/Area Number |
20K14376
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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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| Keywords | ultracold Bose gases / dark solitons / dark quantum droplets / Zakharov-Shabat soliton / quantum vacuum energy |
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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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| Causes of Carryover |
Because of corona virus pandemic, I could not use the grant for travels. In this fiscal year, I will use the grant for academic travels of my collaborator and myself. Then, as for a travel of myself, I will visit Japan including Yamagata University to discuss with Prof. Eto.
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