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Etsuko INAMURA Kazuhito FURUYA
The electron wave device requires large current density as well as high coherence to increase the speed. This letter describes a relation between the coherence and the current density of the ballistic electron transport. The product of the degree of the coherence and the current density is a constant determined by the electron group velocity. Decrease of the coherence in the direction(s) not essential for the interference increases the current density.