2022 Fiscal Year Research-status Report
Detection of quantum states of single electrons on liquid helium
| Project/Area Number |
20K15118
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| Research Institution | Okinawa Institute of Science and Technology Graduate University |
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Principal Investigator |
Elarabi Asem 沖縄科学技術大学院大学, エンジニアリングセクション, 電子機器研究支援チームリーダー (70866748)
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | electrons on helium / Cryogenic amplifier / signle electronics |
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| Outline of Annual Research Achievements |
In the previous fiscal year, the research endeavor faced challenges. The main issue was the constrained time assigned to the Principal Investigator (PI). The limited time, despite unwavering dedication, hampered exhaustive research and significant findings. The PI's need to juggle other duties impinged on the project's focus.
This scenario emphasizes a PI's time significance in accomplishing research goals as laid out in the funding application. Revising the time allocation is fundamental for future progress and catalyzing substantial discoveries.
Despite these difficulties, we maintain optimism regarding future improvements. We foresee that adjusting the PI's time allocation, supplemented by the assistance of other team members, will constructively shape our research course.
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| Current Status of Research Progress |
Current Status of Research Progress
4: Progress in research has been delayed.
Reason
The progress of the research project has experienced delays due to a few key factors. Firstly, the lead researcher transitioned to a different role with increased responsibilities, making it challenging to allocate sufficient time to the project. As a result, the fabrication and testing of single-electron devices have been halted at the preliminary stage, and the evaluations initially planned for the have not been conducted.
Furthermore, our measurement lab was relocated this year, and we will be adapting to the use of a different cryogenic system. These changes have contributed to the overall delay in the project's timeline.
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| Strategy for Future Research Activity |
Continuing this phase of our project, we aim to trap and detect single-electrons on liquid helium using a highly sensitive radio-frequency Single-electron transistor (rf-SET). Our plan involves fabricating an SET with an island as small as 100 nm and employing micro-channels (50 nm) to confine the electrons' 2D mobility into 1D, allowing us to trap them with the SET's island. The fabricated samples will be housed in a copper helium-leak-tight enclosure.
During the next year, we plan to conduct the following specific investigations: (A) A comprehensive study of single-electron trapping conditions using micro-channels and their detection with rf-SETs. (B) The fabrication of the proposed circuit and cell. (C) The exploration of signal amplification methods to facilitate signal measurement at room temperature.
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| Causes of Carryover |
Unspent funds will carry over due to project delays and procurement challenges. The usage plan for next fiscal year includes:
Completing postponed investigations (trapping conditions, circuit fabrication, signal amplification analysis). Purchasing equipment, materials, and covering relocation or cryogenic system adaptation costs. Supporting personnel in expediting research progress and recruiting additional staff if needed. Reserving funds for contingencies and unexpected expenses to ensure smooth research progress.
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