The performance of field emitters is usually analyzed by linear fitting of a Fowler–Nordheim plot. It has sometimes been observed that the fitted slopes and intercepts show a strong correlation, but no convincing explanation has been provided. We propose a simple model showing that this correlation is due to fluctuations in the slope and the fact that the experiments are carried out over a defined range of voltage and current. By performing a meta-analysis, we show that this explanation correctly predicts the results of other groups in this field.
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