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本文指出,由于电磁波在Josephson结势垒中的波长远小于其真空波长并已达到典型Josephson结的线度量级,应该考虑k≠0的有限波数效应。本文导出微波场辐照条件下计入了有限波数效应的Josephson结超电流公式,它也适用于还存在静态磁场的情况。对该公式的分析表明:有限波数效应和数量级很小的静态磁场(如≤0.1G)就可能对微波诱生的常电压电流台阶产生重要影响。例如,偏置电压V0=nhf/2e(n=0,±1,±2、…)处的台阶可能对某些n值不存在的缺级现象,特别是可能出现所有偶(奇)n值对应的台阶不存在的偶(奇)缺级现象;l-V曲线不对称等等。A formula of the Josephson current in the presence of microwave and static magnetic field, taking finite wave-number effect into account, is derived. Finite wavenumber effect on ac Josephson current is discussed according to this formula. It can be used to explain such anomalous phenomena as missing of some rf-induced steps in the I-V curve, asymmetry of the I-V curves.
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