多层约瑟夫森结Fiske台阶的数值模拟研究

In this paper, the numerical simulation on the I-V characteristics of the Nb/Al-AlOx /Nb stacked Josephson junctions (N = 10) are studied on the basis of the inductive theory. A series of cavitylike resonant Fiske steps can be found on the I-V characteristics; in particular, by choosing appropriate parameters, the Fiske steps of the inner junctions are found to appear at the same position. The characteristic velocity, the simulated phase difference, and the voltages all verify the in-phase oscillation mode of the inner junctions. This provides a useful theoretical proof for the Josephson junction acting as a good candidate of high-frequency oscillator.