2019 Fiscal Year Annual Research Report
Hydrodynamic behaviour of electrons on the surface of superfluid helium
Project/Area Number |
18K13506
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Research Institution | Okinawa Institute of Science and Technology Graduate University |
Principal Investigator |
Badrutdinov Alex 沖縄科学技術大学院大学, メカニカルエンジニアリング&マイクロファブリケーション・サポートセクション, ナノファブリケーション サポート エキスパート (30727540)
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Project Period (FY) |
2018-04-01 – 2020-03-31
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Keywords | Electrons on helium / 2D electron system / electron viscosity / polaron |
Outline of Annual Research Achievements |
In the second year of the project we completed theoretical modelling of the experimental data obtained earlier. After analyzing the dataset in its complete form, it became apparent that the hydrodynamic electron transport model could not explain the observed behavior. Instead, we developed a different theoretical model, that related the observed phenomena to the hydrodynamic properties of surface waves of the helium substrate, which are coupled to the surface electrons and, hence, affect electron transport. We have also written a manuscript, based on this model and the experimental data obtained earlier. It was published in Physical Review Letters shortly before the end of the project. We also performed some further experimental effort, in line with the original idea of the proposal. We tried to design and fabricate microchannel devices which allow us to accumulate higher surface electron densities. This would provide yet unexplored parameter space where electron hydrodynamics may still be relevant, and it is also of much interest for other applications with electrons on helium. We fabricated several trial devices with smoother surfaces, shallower channels, and smaller inter-electrode gaps, by employing new materials for electrodes and more sophisticated fabrication approaches. The devices were tested at low temperature by standard measurement techniques. The results were not conclusive so far, and further work is required in this direction.
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Research Products
(1 results)