Abstract
The authors present experimental results on the properties of very small microbridges with high junction resistance. The authors fabricated NbN microbridges with very narrow width ( >k Omega ) exhibit unusual nonlinearity in the I-V relation, which is dual to the Josephson characteristics. The electric field effect in a two-junction array is also examined, where a gate electric field is applied to a center electrode. Experimental results agree fairly well with numerical calculations, assuming that the bridge consists of a one-dimensional array of the single-electron-tunnel junction. >
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