Study on the Quantum Current-Mirror Effect

量子电流镜效应研究

• 批准号: 15310102
• 负责人: SHIMADA Hiroshi
• 金额: $ 4.61万
• 依托单位: The University of Electro-Communications
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15310102/
• 关键词: 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

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.

本研究研究的效果是两个小约瑟夫森结阵列之间的精确电流复制。这种效应的基础是所谓的单电荷隧道现象。因此，在这种现象中预计两个阵列中的库珀对隧道效应具有相关性。在本研究期间，我们取得了以下成果： 1.成功制作了基于电流镜效应的倍流器。从实用角度阐明了倍频器的电路连接方案、偏置电压范围及其与器件精度的关系等特性。电流倍增器的实现是本研究的主要目标之一。2.阐明了该效应的几个特征，例如每个结的约瑟夫森耦合能量与最大可倍增电流之间的关系、倍流器数量的关系等。构成具有镜像效应的电流镜器件的阵列中的结点、镜像效应的偏置电压范围等。 3.在三阵列器件中，我们观察到阵列之间的电流重复，这些重复不是直接存在的。通过连接耦合电容。这是一个未曾预料到的显着现象。这意味着该效应是由于不同阵列中库珀对隧道效应的非局部相关性而不是它们的局部相关性造成的。最后一点引起了人们对这种效应的新兴趣，并且需要对物理学有更深刻的了解小约瑟夫森路口。因此，需要更多来自新观点的研究来充分理解这种效应。

项目成果

Monte Carlo study of charge transport in slantingly coupled arrays of small tunnel junctions

小隧道结倾斜耦合阵列中电荷传输的蒙特卡罗研究

• 发表时间: 2005
• 作者: Y.Mizugaki; H.Shimada
• 通讯作者: H.Shimada

Monte Carlo Study on the Charge Transport in Slantingly Coupled Arrays of Small Tunnel Junctions

小型隧道结倾斜耦合阵列中电荷输运的蒙特卡罗研究

• 发表时间: 2005
• 作者: Y.Mizugaki; H.Shimada
• 通讯作者: H.Shimada

Monte Calro study of charge transport in slantingly coupled arrays of small tunnel junctions

小型隧道结倾斜耦合阵列中电荷传输的蒙特卡罗研究

• 发表时间: 2005
• 作者: Y.Mizugaki