Development of a superconducting nanobridge diode based on the ratchet behavior due to the shape effect and its application

我们研究了利用不对称高温超导纳米桥棘轮效应的超导二极管，旨在超导电路的偏置电流电源等应用。获得了临界电流约为10毫安的单纳米电桥，外加磁场对临界电流的调制率为9%。桥特性与桥线相对位置的关系以及由不对称纳米桥组成的squid的滞回特性为讨论这些器件的物理特性提供了有用的信息。通过数值计算分析了超导薄膜中矩形孔周围涡旋的位置依赖性。它被理解为由于电流分布的不同而产生的势垒的差异。

We studied on the superconducting diode utilizing the ratchet effect of asymmetrical high-temperature superconductor nanobridges, aiming at applications such as bias current supplies for superconducting circuits. Single nanobridges with critical current around ten milliamperes and 9% modulation of the critical current by the applied magnetic field have been obtained. Dependence of the bridge characteristics on the relative position of the bridge and wiring and hysteretic properties of SQUIDs composed of asymmetrical nanobridges are useful information for discussing the physics of these devices. Analysis of the properties by numerical calculation showed the position dependence of vortices around the rectangular hole in a superconducting film. It was understood as the difference of the potential barrier due to the difference of the current distribution.