用微波阻抗显微镜测量无序导体模型系统的局域电动力学
Local electrodynamics of a disordered conductor model system measured with a microwave impedance microscope
摘要：
我们研究了具有预定义网络拓扑结构的超导导体的电动力学阻抗，使用扫描微波阻抗显微镜（sMIM）在GHz频率。对于一个给定的逾渗数，我们观察到强烈的空间变化，在整个样品与网络中的连接区域（集群），当电阻率低，如铝。对于电阻性更高的材料NbTiN，阻抗变得由互连网络的局部结构（连通性）主导。结果可以定性地理解和再现与网络电流扩散模型的基础上的伪逆拉普拉斯的底层网络图。
英文摘要：
We study the electrodynamic impedance of percolating conductors with a pre-defined network topology using a scanning microwave impedance microscope (sMIM) at GHz frequencies. For a given percolation number we observe strong spatial variations across a sample which correlate with the connected regions (clusters) in the network when the resistivity is low such as in Aluminum. For the more resistive material NbTiN the impedance becomes dominated by the local structure of the percolating network (connectivity). The results can qualitatively be understood and reproduced with a network current spreading model based on the pseudo-inverse Laplacian of the underlying network graph.
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