Study on the Quantum Current-Mirror Effect
| Project/Area Number |
15310102
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Microdevices/Nanodevices
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| Research Institution | The University of Electro-Communications |
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Principal Investigator |
SHIMADA Hiroshi UEC, Faculty of Eelctro-Communications, Associate Professor, 電気通信学部, 助教授 (60216067)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 2005: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2004: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2003: ¥4,600,000 (Direct Cost: ¥4,600,000)
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| Keywords | small Josephson junction / current mirror / single electron device / charge soliton / 帯電効果 / 電流ミラー効果 / 単一電子トンネリング / 接合列 / 微小トンネル接合 |
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| Research Abstract |
The effect studied in this research is a precise electric current duplication between in two arrays of small Josephson junctions. The basis of this effect is the so called single-charge tunneling phenomenon. Therefore, correlation of Cooper-pair tunneling in the two arrays is expected in this phenomenon. In the period of this research, we have made the following achievements.
1.We have succeeded in making a current doubler based on the current-mirror effect. Characteristics of the doubler device have been clarified from a practical point of view, such as circuit connection scheme, bias voltage range and its relation to the accuracy of the device. This realization of a current doubler is one of the main targets of this research.
2.Several features of this effect has been clarified such as the relation between the Josephson coupling energy of each junction to the maximum duplicable current, the relation of the number of the junctions in the array which composes the current-mirror device with the mirror effect, bias voltage range for the mirror effect, etc.
3.In a three-array device, we have observed a duplication of the current between arrays which are not directly connected through coupling capacitances. This is a remarkable phenomenon which has not been expected. And this implies that the effect is due to a nonlocal correlation of the Cooper-pair tunnelings in the different arrays rather than a local correlation of them.
The final point brings a new interest on this effect and it will require more profound insight on the physics of small Josephson junction. So more works from new viewpoints are needed to understand this effect sufficiently.
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Report
(4 results)
Research Products
(3 results)
