几何尺寸对圆对称环域Josephson结的准通量子激发的影响

本文研究几何尺寸对圆对称环域Josephson结的扰动SGE的环形准孤子波解的影响.数值计算结果表明,当圆对称环域结的内半径,r₀=7.5λ_J时,已出现对应于环域结准通量子激发的环形准孤子波解,同时在I-V特性曲线上出现第一零场台阶.零场台阶的范围剧烈地依赖于环域结的内半径r₀和结宽度(αr₀-r₀);然而几何尺寸对环形准孤子波解特性的影响则比较复杂. 关键词：

THE GEOMETRY SIZE EFFECTS OF THE QUASI-FLUXON OF EXCITATION IN THE CIRCULAR SYMMETRIC ANNULAR JOSEPHSON JUNCTION

In this paper, the geometry size effects of the ringshape quasi-soliton solutions in the perturbed Sine-Gordon equations (SGE) in the circular symmetric annular Josephson junction are investigated with numerical method. The perturbed SGE, when the inner radius r₀ of the circular symmetric annular junctions is larger then or equal to 7.5λ_J, there exists a kind of ring-shape quasi-soliton solutions, which correspond to the quasi-fluxon of excitation in the circular symmetric annular Josephson junction, and the first zero-field step also. The range of the first zero-field step depend strongly on the size of the inner radius r₀ and widths (αr₀-r₀) of the circular symmetric annular junctions, but the geometry size effects of the nature of the ring-shape quasi-solitons are more complicated.