Giant fractional Shapiro steps have been observed in Josephson junction arrays as resulting from magnetic flux quantization in the two-dimensional array. We demonstrate experimentally the appearance of giant fractional Shapiro steps in anisotropic Josephson junction arrays as unambiguous evidence of a skewed current phase relationship. Introducing anisotropy in the array results in a giant collective high frequency response that reflects the properties of a single junction, as evidenced by the observation of a Fraunhofer like magnetic field dependence of the total critical current of the system. The observed phase dynamics can be perfectly captured within an extended resistively shunted Josephson junction model. These results directly indicate the potential of Josephson junction arrays to explore the current phase relation in a very broad frequency range (down to 50 MHz) and in a wide variety of novel link materials exhibiting non-conventional current phase relationships.

由于在二维阵列中的磁通量量化，在约瑟夫森结阵列中已观察到巨大的分数Shapiro阶跃。我们通过实验证明了各向异性约瑟夫森结阵列中巨型分数Shapiro步骤的出现，作为电流相位关系偏斜的明确证据。在阵列中引入各向异性会导致巨大的集体高频响应，该响应反映了单个结的特性，这可以通过观察Fraunhofer来观察，例如磁场对系统总临界电流的依赖性。观察到的相位动力学可以在扩展的电阻分流的约瑟夫森结模型中完美捕获。