Semicircular Josephson junction embedded in a magnetic field
Semicircular Josephson junction embedded in a magnetic field
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嵌入磁场中的半圆形约瑟夫森结
DOI：
10.1103/physrevb.65.214508
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发表时间：
2002
影响因子：
3.7
通讯作者：
V. C. Kuriakose
中科院分区：
文献类型：
--
作者：
P. Shaju;V. C. Kuriakose
提出了一种半圆形几何结构用于重叠约瑟夫森结以进行实验实现。对半圆形结的分析和数值研究表明，平行于介电势垒施加的外部静磁场通过结内部相互作用，并产生倾斜电势，将捕获的磁通子从结内部推出，并且在没有外部偏置的情况下，结中存在无磁通状态。由于半圆形形状，结端部的有效场具有相反的极性，这支持在存在正向偏置去电流的情况下相反极性的磁通子渗透到结中。当直流电流方向反转时，磁通不可能穿透，并且结点处存在无磁通状态。因此，该几何形状可用于实现基于助焊剂的二极管。使用方波信号和正弦交流信号演示了结的整流特性。在正向偏置状态下，磁通子和反磁通子进入结并沿相反方向移动。利用这一特性，我们提出并演示了双向磁通流振荡器。
A semicircular geometry is proposed for overlap Josephson junctions for experimental realization. Analytical and numerical studies on semicircular junctions show that an external static magnetic field applied parallel to the dielectric barrier interacts through the interior of the junction and produces a tilted potential which pushes out trapped fluxons from the interior of the junction, and a flux-free state exists in the junction in the absence of an external bias. Due to the semicircular shape, the effective field at the ends of the junction has opposite polarities which support penetration of opposite polarity fluxons into the junction in the presence of a forward-biased de current. When the direction of the dc current is reversed, flux penetration is not possible and a flux-free state exists in the junction. Thus this geometry can be used in implementing a fluxtin-based diode. The rectification properties of the junction are demonstrated using square-wave signals and sinusoidal ac signals. In the forward-biased state, fluxons and antifluxons enter the junction and move in opposite directions. Using this property, we propose and demonstrate a bidirectional flux-flow oscillator.