圆对称环域结中涡旋线的激发  

THE VORTEX OF EXCITATION IN THE CIRCULAR SYMMETRIC ANNULAR TUNNEL JUNCTIONS

作　　者：徐昆明[1] 沈亚菲 姚希贤[3] 

机构地区：[1]浙江大学物理系 [2]南京工学院计算科学与工程系 [3]南京大学物理系

出　　处：《低温物理学报》1989年第3期187-195,共9页Low Temperature Physical Letters

摘　　要：用数值计算法研究圆对称环域结的扰动 Sine-Gordon 方程(SGE).在适当的参数范围内,扰动 SGE 存在具有准孤粒子性质的环形波解,它对应着圆对称环域结中涡旋线的激发.我们发现:这种解存在着一个最大偏置电流,当超过这个偏置电流的极限值时,扰动 SGE 的这种解便退化成文献[1]中所述的那种解.扰动 SGE 中这两种解的性质存在着明显的差别.本文的计算也显示出 I-V 特性曲线中的零场台阶.The perturbed Sine-Cordon equations (SGE) in the circular symmetric annular tunnel junctions are investigated by the numerical method.In the region of suitable parameters of the perturbed SGE there exists a kind of ring shaped wave propagations,which can be considered as a quasi-solitary solutions,corresponding to the vortex of excitation in the circular symmetric annular tunnel junctions.As the biased current increases we find a limit value of it,above which the solutions of the perturbed AGE transit to another kind of solutions as we described previously in ref.[1].The behavior of the two kinds of solutions in the perturbed SGE is different from each other s'aliently.Finally,our calculations in this paper make noticeable the zero-field step in the I-v characteristics.

关 键 词：圆对称 环域结 涡旋线 激发 超导体 

分 类 号：O511[理学—低温物理]