Abstract
The aim of this paper is to investigate the behavior of ultrasmall SNS and NSN double junctions at T = 0 in terms of a golden rule ansatz with regard to the normal conducting phase of the superconducting electrodes. The sensitivity of electrometers built from SNS and NSN single electron tunneling (SET) transistors is evaluated for T > 0 including a consideration of the shot noise behavior. Incoherent cotunneling is treated analytically in both SNS and NSN devices and a rough estimation of coherent cotunneling is done numerically in the case of SNS. The influence of a high impedance but ohmic environment is discussed. Emphasis is put on the case Δ < e2/[2(C1 + C2)] (with the capacitance C1,2 of the respective junction) and the effects of discrete states of the central electrode are neglected.
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