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

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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.