Abstract
We study the electrodynamic impedance of percolating conductors with a predefined network topology using a scanning microwave impedance microscope at gigahertz frequencies. For a given percolation number we observe strong spatial variations across a sample that correlate with the connected regions (clusters) in the network when the resistivity is low such as in aluminum. For the more-resistive material (Nb,Ti)N, the impedance becomes dominated by the local structure of the percolating network (connectivity). The results can be qualitatively understood and reproduced with a network current-spreading model based on the pseudoinverse Laplacian of the underlying network graph.
Original language | English |
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Article number | 014039 |
Number of pages | 6 |
Journal | Physical Review Applied |
Volume | 13 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2020 |