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两带超导体边界效应及其对二硼化镁薄膜临界温度的影响研究
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Abstract:
基于两带Bogoliubov-de Gennes理论，我们针对两带超导体–绝缘体(或真空)之间的边界效应展开研究。在两带Ginzburg-Landau自由能表达式基础上引入新的表面项，得到其对超导序参量影响的特征尺度。在考虑边界效应的影响下，我们对二硼化镁超导薄膜临界温度随厚度的变化关系进行了理论计算，所得结果与实验数据相符。
Based on two-band Bogoliubov-de Gennes theory, we study the boundary effect of an interface between two-band superconductor and insulator (or vacuum). New boundary terms are introduced into two-band Ginzburg-Landau free energy, and the characteristic length scale of boundary effect can be estimated. Taking into account this boundary effect, we study the critical temperature dependence of film thickness for magnesium diboride. Our numerical results are in good agreement with the experimental data measured in this material.
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