The double tunnel junction M1-S2-M3 consists of generator and detector tunnel junctions with a common electrode S2. The quantity R 2(E), the time rate of change of the quasiparticle distribution function (produced by the generator current), is calculated for each branch of the excitation spectrum in S2. The rates of change of the quasiparticle number density \.n 2, the particle branch imbalance \.Q 2, and the distribution function branch imbalance \.Q 2 *are also calculated. The detector excess current-voltage characteristic δI dvs. V d is calculated for arbitrary excess distributions δf < (E) and δf >(E) in S2. Computed characteristics are obtained assuming square distributions of appropriate amplitudes for δf <and δf >; these characteristics show a zero-voltage current δI d(0) and asymmetric structure at eVd = ±(Δ2 + Δ2) and eVd = ±(eVg − Δ1 ± Δ3). The square distributions are only approximate; the actual distributions would produce additional structure at eVd = ±(eVg + Δ1 ± Δ3). The results are discussed for M1 and M3 either normal or superconducting.
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This work was supported in part by the National Science Foundation through grant DMR 74-23661.
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Paterson, J.L. Analysis of nonequilibrium double tunnel junctions. J Low Temp Phys 33, 285–303 (1978). https://doi.org/10.1007/BF00115000
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DOI: https://doi.org/10.1007/BF00115000