We present an analytical expression for the spectral density of the current flowing through a one-dimensional array of identical small-area tunnel junctions. Negligible stray capacitance, zero temperature, and the voltage close to Coulomb blockade threshold were assumed. Single-electron oscillations appear explicitly (i.e., their linewidth becomes less than the average frequency) when the number of junctions is larger than {~}15.
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Alexander N. Korotkov (1994) studied this question.
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