Single-electron traps: A quantitative comparison of theory and experiment

Abstract

We have carried out a coordinated experimental and theoretical study of single-electron traps based on submicron metallic (aluminum) islands and Al/AlO${}_x$ /Al tunnel junctions. The results of geometrical modeling using a modified version of MIT’s FASTCAP were used as input data for the general-purpose single-electron circuit simulator MOSES. The analysis indicates reasonable quantitative agreement between theory and experiment for those trap characteristics which are not affected by random offset charges. The observed differences (ranging from a few to fifty percent) can be readily explained by the uncertainty in the exact geometry of the experimental nanostructures.