Superconducting junctions perturbed by environmental fluctuation.
A superconducting junctions device is investigated in the case of the environmental perturbation. It is found that a net voltage can be produced, whose absolute value represents a phenomenon of resonance versus the additive noise strength, and may be negative, positive, and zero. By controlling the correlation between the additive and multiplicative noises, a reversal for the net voltage can be induced. The dc voltage versus the dc current is studied. It is shown that (1) with increasing the additive noise strength, the curve of the dc voltage versus the dc current is nearer and nearer to the one for the Ohmic theorem; (2) the behavior of the dc voltage versus the dc current can be manipulated by controlling the noise's strengths. In addition, we study the mean first passage time (MFPT) for the electron pair over a period of the potential, and find that the transition rate (i.e., inverse of the MFPT) can be suppressed by the positive correlations between the additive and multiplicative noises and show a minimum as the function of the noise's strengths.
Li
Jing-hui
JH
CCAST (World Laboratory), Beijing, China.