| Project/Area Number |
18K13506
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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 13030:Magnetism, superconductivity and strongly correlated systems-related
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| Research Institution | Okinawa Institute of Science and Technology Graduate University |
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Principal Investigator |
Badrutdinov Alexander 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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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | Electrons on helium / 2D electron system / Electron viscosity / Polaron / electron viscosity / polaron / electrons on helium / electron hydrodynamics |
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| Outline of Final Research Achievements |
The original goal of the project was to demonstrate signatures of hydrodynamic behavior of electrons on the surface of superfluid helium, as this two-dimensional electron system looked particularly appealing for this purpose. As a result, we observed a novel transport regime in the system, however, of a different origin. Surface electrons are known to couple to surface capillary waves of helium, forming polaronic particles. We studied the transport of surface electrons through a microchannel structure in which the charge flow splits into two branches, one flowing straight and one turned at 90 degrees. According to Ohm’s law, an equal number of charges should flow into each branch, however, when the polaronic particles have sufficiently large effective mass, all the charge follows the straight path, due to momentum conservation. The underlying physical picture is that electrons are carried along the straight path by surface waves, which tend to propagate straight.
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| Academic Significance and Societal Importance of the Research Achievements |
Our result should have wide academic impact, as it is relevant to a variety of polaronic-like systems.
In addition, possibility to use surface waves on helium to carry electrons without employing electric fields is interesting in the context of mobile spin qubits based on electrons on helium.
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