| 研究課題/領域番号 |
20K15118
|
|---|
| 研究機関 | 沖縄科学技術大学院大学 |
|---|
研究代表者 |
Elarabi Asem 沖縄科学技術大学院大学, エンジニアリングサポートセクション, リサーチサポートスペシャリスト (70866748)
|
|---|
| 研究期間 (年度) |
2020-04-01 – 2023-03-31
|
| キーワード | electrons on helium / single-electrons / Cryogenic amplifier |
|---|
| 研究実績の概要 |
In previous studies, we developed a technique to detect electrons floating on superfluid helium and determine the Rydberg state of these electrons[1]. Subsequently, we have developed a two-stage cryogenic amplification technique to detect the image-charge in a bandwidth of 10MHz[2]. Using this technique we were able to observe -for the first time- the real-time excitation and relaxation dynamics of electrons due to pulsed microwave simulation[3]. Because of these experimental results, we can make several important conclusions related to the relevant time-scale of electrons excitation and relaxation processes.
References:
1-Phys. Rev. Lett. 123,086801(2019).
2-J. Low Temp. Phys. 202,456-465 (2021).
3-Phys. Rev. Lett. 126,106802(2021).
|
| 現在までの達成度 (区分) |
現在までの達成度 (区分)
3: やや遅れている
理由
The researcher carrying out this research plan moved to a different position, and took on more responsibilities. Finding more time to allocate to this research project was difficult and currently negotiating to allow more time to be allocated to this research project. For this reason the fabrication and testing of single-electron devices has stopped at the trial stage described earlier, and the testing of these devices scheduled for the first year have not been investigated.
In addition, the measurement lab is scheduled to move this year, and the usage of a different cryogenic system is currently in development.
|
| 今後の研究の推進方策 |
Following the plan for this phase of the project is to trap and detect single-electrons on liquid helium with a highly sensitive radio-frequency Single-electron transistor (rf-SET). A SET with an island as small as 100 nm will be fabricated. Micro-channels (50 nm) will be used to confine electrons' 2D mobility into 1D to trap them with the SET's island. The fabricated samples have to be enclosed in a copper helium-leak-tight enclosure. The following specific investigations are planned during the Fiscal Year 2021: (A). Detailed study of the trapping conditions for single electrons using micro-channels and detection using rf-SETs. (B). Fabrication of designed circuit and cell. (C). Analysis of signal amplification methods to measure the signal at room temperature.
|
| 次年度使用額が生じた理由 |
To continue the research plan.
|
